I run XP with SP2, it's been operating fine. I use the defragmenting system tool that comes with Windows XP, the one found in Accessories. It defragmented my files perfectly until yesterday. Now it only goes as far as 3% and gets stuck there. I have to shut the computer down manually to stop it running. Everything functions fine including System Restore. The System checks indicate that the defrag operation is normal and healthy, but it obviously it is not. It seems to get stuck trying to move a couple of avi files I can't identify . Anybody know how to get the defragmenter to function properly again? I have 85% free space left.