According to MS support requirements for Windows 8, a processor must include the PAE, SSE2, and the NX bit instructions sets. While PAE has been included in Intel CPUs since 2001 and SSE2 has been in them since 1995 the major instruction set to verify is the NX bit (aka No Execute or Execute Disable bit instruction set). NX has been supported in x86 and x64 processors since Windows XP SP2 and Windows Server 2003 SP1 (Windows XP Service Pack 2 (SP2) was released on August 25, 2004).
Intel CPUs manufactured prior to Feb 2004 do NOT include NX bit, but will pass the Windows 8 compatibility tool. The NX instruction was not implemented until the introduction of the Prescott family of processors in Feb 2004. This means that, as far as Intel CPUs are concerned, the Willamette (Nov 2000), Northwood (Jan 2002), and Gallatin XE (Sep 2003) famalies of processors will NOT be windows 8 compliant.
Unfortunately, we have had reports from consumers who ran one of these non-compliant processors that the ‘MS Windows 8 Compatibility Check tool’ reported that their system WAS compatible, which lead to an error being reported on reboot with 0x0000005D. This means Either your processor is not Windows 8 Compatible OR that the NX bit instruction set has been disabled at the bios level.
What a 0x0000005D means
What was said when someone saw a 0x0000005D
http : // www . techplex . net/postst79919_Can-t-install-Windows-8-Pro–TechNet-Standard–Version-commercial–fr-windows-8-x86-dvd-915420-iso .aspx
Microsoft’s Compatibility Documentation
What is NX bit