cannot change registry settings Back?

[geeoff1]

In Win2000, I changed the level 2 cache setting to take advantage of the 512k my old P-III 500mhz had. I've since upgraded to an 800mhz coppermine, and whether I set it at 0 (256) or 256, after the reboot, it's back at 512k. Anyone have any ideas? THANX!!!!