Need urgent help on new build PLEASE

[v2008]

Guys I just build my pc and whenever I start my PC the following message comes up:
CPU is unworkable or has been changed. Please go to the softmenu.
However my PC works fine and I can go on XP and all.
Is my CPU not functioning properly or do I have to change some settings. Please help guys. Thanks

 

[v2008]

I installed XP the first time and everything seemed fine. Then when I was installing the motherboard drivers, the PC got stuck. So I tried to reinstall XP and it gets stuck half way through. Does anyone know what the problem could be? I checked all the hardware and it seems fine.