New processor wont work

I recently traded processors on exact motherboards on different units one was a 2700xp the other was a 1800xp, when i installed the 1800 onto the cpu that was running the 2700 the system wouldnt boot, then i cleared the bios, and had to re-activate windows but after doing so the systems restarts after every boot and is never able to log on and i get a page fault in nonpaged area blue screen message?? can anyone help to get this processor to work in the other computer??

the mobo is a a7v8x-x asus i dont think it has esp but i have messed around with all the mobo settings??

winblows doen not tend to like prosessor changes in windows either. Use fedora or redhat linux and you will be better off.

ok i figured out the problem for everyone wanting to know... when i installed the 1800 i ran it at 100fsb and the lowest ghz setting possible then booted windows, after the restart i changed it back to 1.5ghz and a 133fsb and everything seems to run smooth so far, but thanks for the help