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Windows 8.1 Install Fails, 8 Installs fine. (Not the usual CMPXCHG16b, PrefetchW, and LAHF/SAHF problem)

Hi All,

I have 2 machines with this problem now, both 64 bit (one a Pentium D, and one a Core 2 Duo), they both used to run Windows 7 x64, and both now have clean installed Windows 8 x86 on them (because I didnt install x64 as this a) didnt boot the installers) and b) wouldnt run as these both seem to not have one of the CMPXCHG16b, PrefetchW, and LAHF/SAHF instructions.

I'm happy with them running x86 but would like them to be running windows 8.1.. 

Now I'm an MSDN subscriber, so I have downloaded and tried to boot the x86 versions of 8.1 (all editions), and all of them abort during boot at the blue flag with a "sorry your pc has had a problem and needed to restart"

I then thought I could install 8 and upgrade it in place using the store, so I installed 8 pro, and downloaded the update, which reboots the PC (happens same on both), and then crashes during boot at the same point.

I understand that the x86 version doesnt need the extra CPU instructions.. so why doesnt it work?

Any ideas?

Thanks, Sam



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