Recently a user in my house (I'm protecting the victim) opened a file called cmos.exe and who knows what else.
For some reason the anti-virus software (AVG) didn't catch the file(s) and some bad stuff resulted. Next time I rebooted I was greeted by a screen bearing "99 99 99 99 99 99 99 99No Operating System Found"!!!!
Fearing the worse I popped in the windows xp installation cdrom and activated the repair console and ran the fixmbr command. I was meaning to do that since I uninstalled linux and still had the old grub bootmenu popping up. So, that resulted in a successful boot back into XP with all my files intact by NO CDRW showing up i.e. no drive letter in explorer or from the command line. I tried upgrading the firmware for the drive (optorite cdrw-5202) and checked to see if the bios was able to detect the drive, it did, which goes without saying since I was able to run the xp install disc. I tried draining the cmos, I think, by removing the battery and waiting about 2 min and replacing it and rebooting. I also uninstalled the cdrw from the device manager and rescanning without any luck (in safe mode and and as administrator.) I'm really stuck on this one.