Hi, I am running Windows XP SP2 and have been having a problem the last couple of days. I want to avoid formatting if possible, so I hope someone can suggest something. My computer is on most of the time. I had it running for probably 2 weeks straight without a reboot and was running great. Turned it off the day before yesterday because we are having power problems in the house... Then yesterday when i turned my computer on, if I tried using windows explorer it was lagging like hell. So i had a look at my resources and explorer.exe seemed to be using all the CPU... sits around 90%. So i ended task to explorer.exe and all my programs kept running fine.... but of course didnt have a start bar etc... so i ran explorer.exe again and everything was fine. Turn my computer on again today and it is having the same problem. Sometimes now when i end task to explorer.exe and start it again, it starts using all the CPU again. end task, start it again and its fine for an hour or so. I think the more i use windows explorer, the more I have this problem. I have done a full scan with updated versions of mcafee and ad aware. Can anyone suggest anything else? Your help would be much appreciated.