OK, I've pulled out most of my hair by now! Breathe... breathe... OK, I'm back. A client asked me to look at his *extremely* slow Dell Dimension 8200 desktop. I noticed that the 120GB hard drive had about 1GB of free sapce! After copying 60GB of photos to an external hard drive and then deleting the files to get some breathing room, I rebooted to see how things were. Definite improvement. Of course McAfee wouldn't shut up (I told him there are far better AV progs available) and the PC hung. Mouse and keyboard locked up. I couldn't do anything. I pushed in the power button since there was no other way to reboot. That's when the problems started. PC won't boot in Regular Mode. The loading bar stops moving and freezes. Can't boot using LKGC. When choosing Safe Mode or Safe Mode with Command Prompt, PC freezes while loading agp440.sys. When I boot off an XP installation CD, that freezes at the "Setup is Starting Windows XP" message. Dell diagnostics doesn't show a bad hard drive. Could the mobo have been damaged? Help!