This was posted by @Jan1 in MDL :
)
The guideline he posted was to install win8/win8.1 on a clean HDD, the following is for installing in a PC with win7(I guess this is actually more common scenario , and more easy and simple to work too
):
1. Download w8patchKit (@Jan1's patch tool, GimageX, EasyBCD, coreinfo, win7 reg tweak):
2. In win7, make a new partition min. 16G and format, I do it in VMware, new drive E: 20G
3. Check with coreinfo on what your CPU doesn't support, or, you can say "LOL, what the heck" - and simply apply both patches to bypass NX/PAE/SSE2 altogether.
4. Mount the win8/win8.1 ISO, I use win8.1 Pro X86 Chinese, if you don't have a ISO apps, open it in winrar. Copy sources\install.wim to C: or anywhere you like.
5. Open GimageX, goto "apply" tab, source is C:\install.wim ; destination is E:, and apply
6. If you have not installed "right click take ownership" apps, launch "win7 reg tweak".
Then goto E:\windows, take ownership of System32
7. Open @Jan1's patch tool, right click W8CPUFeaturePatch -> run as admin ; I clicked "remove SSE2 & NX check" ; and on the browse windows choose E:\windows\system32\ntoskrnl , run and get the "Done" pop-up
8. Apply the "remove winload patchguard X86" ; this time choose E:\Windows\system32\winload.exe
9. Install EasyBCD; add a boot item to boot from E: ; name it windows 8 or whatever you like, and set it as default.
10. Open CMD(Admin); enter bcdedit /enum ; check that windows 8 is identifier "default", and is in drive E ;
then enter(paste) : bcdedit /set {default} NoIntegrityChecks Yes
11. REboot, in the boot menu choose windows 8 ; and it should proceed to install ; suggest you choose "custom setup" and disable windows update, otherwise it will also install all the updates, and a risk to cause trouble in setup, you can enable it after installation.
12. Done!
If anytime in the installation, or after a update, you get a 0x0000005d error (processor not compatible) ; boot into win7 and run steps 7, 8, 10 again.


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