I don't know what happened, but the situation is clear. In the last week, I've had Windows Update install a new PCI steering patch. It must be reinstalled at every bootup. I added a TNT 2 32MB video card, for which Win2K already ahs a driverbuilt in. It must be reinstalled at every bootup. I upgraded from an early P-III 500 (with 512k level 2 cache) to a 800 coppermine (with 256k level 2 cache). I had edited the 512k cache into the registry. I have now edited it back to 256k, but at every reboot it resets itself back to 512k. I have diabled, and re-enabled the system file protection, and it makes no difference. What the hell is going on? Please, any ideas?