AHA! i just had a look in my erm... something (before you load up windows) and it said my cpu frequency is 166. so, is what that other dude says right? about the multiplier being wrong (or something along those lines.)

http://www.amdboard.com/sempron.html

I'm not exaclty sure as to what processor you have exaclty, but this website above gives a listing of the processors and their "stock" memory, front side bus, and multiplier settings. Make sure your bios has these same settings to match the processor that you found using everest.