BSOD on boot up corrupt ntoskrnl.exe

I am working on an hp Pavilion xt963 with windows XP. It will not boot and gives me the "file is missing or corrupt: <Windows root>\system32\ntoskrnl.exe" message. I have tried to reload windows and load live linux cds nothing works. How do I get past this to reinstall XP or a linux system??
 
I have an installation cd, but cannot get into BIOS to change boot. The first screen I get when I try to boot is the BSOD??
 
Fixed

F1 let me into BIOS to change boot sequence. Repair disk did not repair, but was able to reload XP and computer is running nicely. Thanks so much for your help
 
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