Windows 10 , install limits , beyond the Microsoft terse statements"          
"1G Hz CPU speed, 1GB Ram,  HDD(SSD) big enough 20GB is wrong!
"
 The truth is (64GB or 128 sized HDD are better)real minimum limits.
 (you need space for huge W10 updates, and for your App.'s, like OFFICE)

 

The 1 clear and hardline truth is , Microsoft does not make Chips (I.C's , processors, or sound chips , Lan ) of any kind, so MS must get drivers from the OEM or CHIP maker.
The normal path is ( Chip maker >> to OEM (OEM changes things) >>> and is sent to Microsoft for PnP plug and play and for OS , install media  libraries.
This means that if the maker does not support W10 there will be no support. (if you are smart, change out the chip W10 does not like , like a new video card)
Even mighty Intel tells you which chips they made that do not have any W10 support, clear as day. (like these old GPU from Intel)

Intel also said clear as day, that their new chips only support W10, ( that means no W7 support on those or older OS.) 
If you think that is bad news try 64bit. ( very strict CPU limits by Intel and AMD!) (and 64bit has very strict Certificate rules for sure on old drivers, with expired or missing Cert's)

There are 2 versions of W10 (besides Home, Pro, etc. versions, and that is 32bit, and 64bit.)  Windows 32bit is now going very fast NOT SUPPORTED !
The ISO download is free to try for 30 days, so there is no reason to not try, really.
32 bit runs best if at all on old computer, but not relic computers, say over 10 years old.
64bit is best of all, but is very very limited on old PC's  , in fact W10-64bit fails to load, on many older PCs that run XP to W7-64bit now.
Older than 2011 is problematic.
The top complaint here (besides will not install) is dead chips, post install, ( Sound chip dead, Ethernet and wifi and even graphic Engine dead or 1/2 dead ! or stuck in 800x600 resolution for ever.)
When I said "engine",  that means GPU logic inside the CPU or outside (onboard or in the PCI-e x16 slot)
In both cases 32/64,  if your PC has unsupported chips (not bad) but old chips that support for it ended at XP,VISTA or W7, just be aware, nobody can make driver pop out of thin air. (dead support equals no drivers on earth)

6
4bit is limited
by the processor present (Gen 4 up  Gen3, upgrade only) and the HD graphics chip (and even BIOS versions) Fresh Installed of 64bit may need Gen 5 ECU up.
Ask Intel what Processors are supported this year, as they can change there mind, and even dropped Intel ATOM processor support (most)
Geek-speaks: (the CPU advanced features needed and short answer for eash:
64bit WIN10:   (win 10 needs  NX and PAE features, but not W8)
"Your processor needs to support "  ( do not forget to enable some of these in BIOS, NX is one)  Orderig below is least likely missing first.
  • 64bit processor (easy, it does or does not have X64 & x86(32bit) both instruction sets)
  • CMPXCHG16b, Only some early AMD processors did not have this. AMD 64-bit processors, before Rev F (relic city forget this)
  • PrefetchW, (AMD 3DNOW) again older than 2008 or pre Intel Nehalem processors
  •  LAHF/SAHF ,  mostly limited to certain low-end processors predating Nehalem, before 2008. Some very old AMD64 processors also lack this feature.
  • PAE ( introduced with Pentium Pro) 1995 (no concern now) Used for over 4GB ram , seen first (@MS)  in XP 64bit.  (almost 2 decades ago)
  • NX (or XD bit (an NX bit implementation ) "No Execute"  a top security feature ! Buffer overflow attack prevention (AMD =EVP)  Intel Prescott core(Pentium 4) introduction.,2004 ! (early P4 fails)
  • SSE2 , Windows 8 required this first. (@MS) Introduced with Pentium 4, Xeon, Celeron, Pentium D, Celeron D) Intel Pentium M and Celeron M , and Intel Atom, and newer processors.
  • TXT  (trusted Execution tech) starting in 2006, most have it but each generation has 1 model missing TXT. May not be required?, I see some folks have i3-2100 with w10-64 lacking TXT and runs ok.
This list above  is overkill  in the year 2019 up, most processors today on your desk or lap, do the first 5 in the list.
Not all chips are born 100% perfect.  (study,  Silicon chip Defect densities by feature size against DIE size !)
All large chips for sure CPU have defective sub sections, on a newly made wafer, one can understand this, and why Intel sells the full I7 for top dollar and i3 for less even though this MASK set and stepping is in fact i7 core.

And read this Jewel. (true when I worked there)
Consider this? , what if Intel had some real magic, (David Copperfiled or by some DIETY) tomorrow yields are 100% ,what would the marketing goons do next,?  I guess they'd kill good chip features to sell them.
Just like they do with Cars.
Or lower all the prices and drive AMD out of the market (or chapter11) in the flip of a switch. (but sorry magic does not exist)
Details on why chips have bad section features or 1/2 the CACHE dead.
They can also repair some failures with redundant circuits and or shut down dead areas to save power on DIE with dead features.
It is like cutting diamonds here, nobody throws away a huge diamond if one facet is not prefect, not ever.  (ever wonder what  a Celeron is?) 
Intel sells some defective/ faulty or not COMPLETE processors, and have special partnumbers for those that can be used  for dirt cheap PC or even toys.
If you are curious,  look up newer CORE(tm) chips with the NX bit feature dead,  and its cute and very unique part number. 
This is not  negative commment by me, hell I'd do the same thing in charge. For a fact. (I even worked at intel  6 years {NDA}) The model names and numbers are very convoluted and expected by me.
Intel may also down grade good chips to lower grade for HUGE CUSTOMERs (if the profit works why do otherwise?) (that is why the label is painted (laser etched) on last just for this one cute trick)
The early versions of Xeon even run W10-64, but not many E-nnnn versions. (E for economy ) The best early Xeons have Xnnnn P/n, (L prefix is low power)
As a rule of thumb most CORE processors run great, but not  CORE 2 or DUO ( but only the real P/N and matching data sheet tells the truth here)

The truth is Microsoft installer runs some advanced instructions, and if 1 fails the CPU is NO GOOD for 64bit, Microsoft does not care why, only the PC maker or the person picking the wrong CPU is the blame, never is it Microsofts.

W10-64 has many limits on the processor to get all full features and a secure OS.  (W10 has   newer minimum security levels, that must be met) <<< the real truth to know!
Do not try to upgrade 32bit to 64bit and you must boot the install media to load w10 64 bit fresh , there is NO OTHER WAY !
The other reasons to fail the installer are below.

W10 limits:
64 bit will also fail on some Motherboards and due to wrong BIOS versions, or in fact all BIOS levels banned on this mobo.
There is no UEFI mandate, My 256GB SSD (M.2) runs MBR NTFX formatted drive ; 64bit PRO, as I type now.  I run ASUS top motherboard in CSM (dual BIOS, legacy mode)

32bit is also has limits: (for sure 10 year old PCs and older...)
Only because main chips in the PC are no longer supported (that  means chip maker is GONE or flat refuses to support it now , nodody can force chip makers to support W10)
Even Intel new chips will not support W7. (going backwards to W7)

The next thing  that will limit you, will be the GPU present and for sure how old it is.
The GPU makers are many ,   Video chips are just 4 makers now, 2018 (AMD-ATI, INTEL, Nvidia, and VIA) (chip means GPU engine regardless of locations)
GPU makers do NOT have drivers  for Tens of thousands of GPU made for 20 years. Ok, it's not going to happen. Do not hold your breath like mom used to say.

So ask them first.  AMD/ATI chips, Intel HD graphics ,  Nvidia, VIA ,   so  wiki has the dead pool list. Here)
AMD motherboards very old with Nforce chips sets are there worst.
I think Nvidia  has the best support of all.

Wishing for w10 drivers from dead chip maker is silly at the least (sad to watch)  Intel  page  super good  here on  HD GMA limits.

Dead PC makers here, huge.
Learn that Microsoft can not ask the DEAD for any driver, that be IMPOSSIBLE.
In the case of Intel HD they make the base rules here, your OEM will not write drivers for Intel HD.
The intel HD graphics limits are here, and 32bit on GEN4  is by SKU, (means based on each OEM PC makers rules!!!)

Basically, Intel Graphics (GPU), the  HD 4200 and above is supported but not below.
The newest driver page at Intel for HD Graphics engines are here.
The 4200 came with the  Haswell CPU GT2 in 2010 all the older HD engines are not supported Ivy Bridge and Sandy Bridge or older,  Intel can change their mind in  nano second but this is true now 2018.
That means Intel 2000 to 4000 GPU is not supported.

The W10 support page for CPU  compliance and other factors , but not covering non Intel graphics engines is where.
AMD-ATI,  and Nvidia has rich support on W10, if  you have their GPU, do not skip going there 2nd, after OEM support checks fail.
If on a Desktop (real ATX spec) you can upgrade to better GPU Video card, easy. (w10 supported and VAST)

The worst case are laptop, due to 2 reason and more,  the laptop GPU is soldered down (99% true on cheap laptops/notebooks) But not my Elitebook.
The other big reason is custom video ram on the mobo, or shared with main memory (cheap Emachine like)  and intel only provided a base driver (kit) and the OEM made many changes to that base.
Do not forget that  in many cases if W10- installer does not like your PC , replace that part that it does not like, up grade the device, CPU, GPU, Sound, or Network chip, even BIOS upgrade it !!!

FINGER POINTING 101: (OUCH)
If you look closely in the links above, Intel is dropping 32bit support, it's days are numbered. (remember 16bit, yeah same deal)
Intel is also dropping w7 support on new processors !!! W7 is doomed by MS  and now by Intel, soon. (I'm sure a dream come true for them and vastly better support in the future)
Sure w10-32  may  load on many old PC, but is not supported, by your OEM or seems to run but keeps crashing, so who can you blame, they told you not to do this...
Do not forget that  if something is dead, you can replace it.  (many times , but not a GPU on a laptop, 99%)
Desktop PCI-e slots, put in a new card there that replaces that which is found dead forever running W10,  (ethernet,wifi,sound,video)
On laptops there are no PCI-express slots. So in this case buy a USB Dongle that will replace that which was found  incompatible by W10.
If W10 does not like your Sound (audio chip) or GPU , or LAN chip, Replace it, with one that does.
In most cases replacing the CPU is not going to work (CORE2 CPU DO NOT swap with newer and vastly more modern CORE(tm) the later GEN5 up is best.)
One can buy PCI cards with new chips,  or USB dongles with , wifi, sound, ethernet,  and in BIOS TURN OFF  those things W10 does not like and surplant it with new chips. (PCI/USB)
The 2 show stoppers are BIOS wrong versions and wrong CPU.
One more secret?  Turn off UEFI, totally and install W10 as only GPT drive. (or even MBR if you are below 2TB HDD) Then magically W10 likes you motherboard and HDD/SSD.

Now the facts of life,  and how to point fingers (best is not, until the truth is known, ok?)
Intel did not make your PC nor design it, (exceptions)  your OEM did that, like HP or DELL,  and yes, point fingers there. (if need be)

Microsoft did not make your PC either (it's not an Xbox) nor makes chips, and they got  the PnP driver from your OEM, so again, don't blame MS.com?  it's not their design. (nor is the PnP driver theirs )
So if the OEM says no W10 support believe it,  and that puts the finger pointing  squarely on you. (a fact) (but do try see if it works the OEM does not test all 10,000 models for W10 support, sorry never going to  happen,ever.
They told you not to upgrade, but failed to listen, ( me too....I do as I want and replace parts that the OS does not like, using new PCI-e cards or new USB dongle device, killing the other dead in BIOS first)
I can also turn off the onboard GPU chip in BIOS and insert my w10 rated, GPU PCI-express card and W10 is happy to load and run .
But as they say JUST DO IT. (hdd must be good  and I test it first)

But trying out W10 costs you nothing with a blank 8GB thumb drive in you repair kit. (we keep a box if those with w10,w7 and linux ready to  boot)
Try it , then if one chip fails to work?,then you  talk to THE chip maker, not the OEM they already told you NO. (in vast cases)
Many chip makers drivers do not work direct from them, (GPU do) but not Sound chips most of those are very greatly modified by the OEM PC maker,  so only their driver works.
The reason is complex on SOUND (audio) the maker adds other chips to the sound function and links it to HDMI sound. (so only OEM drivers work and those send to the MS PnP servers)
The same can be true for wifi,  it has other things the OEM added to make all feature work together, like that silly airplane mode dedicated button on top that laptop panel, oops, now dead.
My HP Elitebook , has no support for W10 at all (I got 64bit to work) using W7 drivers force loaded using the install compatiblity mode trick. (the keypanel started working)

Knowing this facts make solving problems more easy or avoiding too.
If chip maker ends support it is not a conspiracy,  no chip makers has drivers for every chip they made for 36 years, it's not going to happen.
If fact most makers are now GONE ( left the business or ended that product line long ago, or  merged with other company or was  take over ) Like GATEWAY/Packard Bell/ too.(now acer.com)
Vast numbers of  chip makers do not exist nor PC makers, vast. (wiki covers all this is  you want to learn who they are and when they died for any and all reasons)


Now my beef with MS.com
Why in the world not publish a compliance engine,
Down load it and  ("can_ I_ use_ W10. exe) and run it. As seen below:
 
My guess their answer might " gee W10 is free to try, so use the free version  to test". OK I lose. (so they saved a fortune at MS, by allowing 30 day trials)
Even use the free W10 to  test on spare HDD with your old HDD removed for a instant and 100% easy REGRESS PATH if it fails or you don't like W10.


After W10 installed things can be:
Dead
means (not a bad chip blown out it means dead/wrong or missing or corrupted driver)  (if your OEM PC maker has no drivers for W10 , you can look further below)
My use of this term means ,any  maker of chips (or chipsets), is no longer in business, left the business, or merged with Kraft and now makes Catchup (LoL) ?
or they ended support on old chips now, and only support chips 10 years old or newer, (cry to their board of directors? ok? I bet they called the shots, no?)
Case in point Intel ends W7 support on new processors and related chips. (Warning will Robinson !) W7 is now doomed, (faster this path is)
Nvidia click line 1, pick legacy and read.
Learn to go to your chips, makers website and read what is there, (Broadcom or Realtek)
Drivers  come from 3 sources: (in order)
  1. PnP at Microsoft.com  let Plug and Play do it job these are Qualified drivers!
  2. The OEM driver at their web site,  they also sent it to MS above, so.... that is why MS is first.
  3. Chip makers. (Intel, ADM/ATI, Nvidia, and many more) Last always last in panic mode. (sound and wifi may still fail) but GPU drivers mostly work.
  4. Dead last is force feeding say W7 driver to W10,  this can work , all you do is rightclick the Setup.exe file in W10  and click W7 compatiblity (YDMV, your wrong driver may vary)
Do not buy driver from lying dog, scalper sites, that promise you all drivers and none work.  They also give you a nice VIRUS.(for free)

If all 3 told you there is no W10  driver, believe them. (or try step  4)


Here is a list of baseline dead makers.

How to know if W10 will run on my PC.?
  1. IT IS  free to try for 30 days, so go in to your closet, of your spares shelf  and get any old HDD. say 100GB or bigger, or SSD. (a used good $20 HDD, erased is the best way to do this)
  2. Remove your PCs HDD (or pull the data cable), and put in the above test HDD erased first and not failing S.M.A.R.T TESTS. 
  3. Connect the router in your home to the PC with a CAT5 Ethernet cable works best . (plug and play needs to work and for sure now.)
  4. Insert the W10 install media. (USB is best)
  5. Boot the media and fresh load the old HDD with W10 , do not forget to remove the  USB stick when told to!
  6. See now what works and what does not.?  (is this hard?, no it is not.)
  7. If any feature (device) is dead, or shows errors in device manager? go to your OEM web site, and get the newest driver from them first. (above Plug&Play failed)
  8. If the OEM (say PC is HP) fails to run then get the driver from the maker of the chip that fails. (this is the last chance to make that chip work)
  9. Do not get drivers from Russia /IRAN or from driver scalpers or malware sites, if Firefox v61+ says its bad it is, same with dead certificate web site, RUN AWAY From there. (sad I have to say this at all)
  10. Run Virustotal.com on all drivers downloaded, first.
  11. The Intel.com chipset w10 is here and is safe, but if  you read this , they tell you some things your OEM added will be dead with this driver, Intel did not make your PC, ok? AGP is now dead, as 1 example.
Drivers are best tired, by official authority, and that is microsoft Plug and Plug ,even when Installing the W10.
Next is the OEM  has them, so go there and get them and load them.
Last the the chip makers web site direct. like Nivida.com

Never run hackers /scapers driver sites JUNK, software drivers ever, ( unless malware is fun for you or worse; there is no limits on worse)
Learn this, if your OEM does not support W10 , Microsoft Plug & Play will fail too, why? , well the OEM did not send it to MS.com , that is WHY !
Windows 10 will refuse to install on PC's  with old motherboards and its many chipsets, or BIOS version, it does not support. (AMD nforce chips love to fail here)

version 4.  9-9-2018