I always get this on AMD XP chips, corrupted windows more times than I care to remember.
AMD dont seem to like FSB increases like intel, multipliers are the way to go..
I struggled with an xp2700 trying to get 200 FSB, got a 3200xp (rated at 200FS
& no problems with same mobo & memory. Doesn't rule out memory entirely but certainly points to the CPU being the main limiter.
Looks like the 64 versions are similar.. Lots of volts required for FSB increases, roll on mobos with unlocked multi's (or 939 pin FX 53