I'm using windows XP on a hard drive which was recently converted from FAT32 to NTFS. The overall CPU usage shows as 100% where as that specific to explorer.exe is ~90-98% and stays like that until explorer either crashes or is ended (not a reboot).
I have noticed that this could be triggered by an attempt to delete a specific .avi file. This file was downloaded from a buddy using MSN Messenger but interupted half way through as MSN Logged off. When i try to delete the file windows says that its being used by another proggram (which makes no sense because it isn't messenger stopped the download and no other filesharing proggys or public access is online), then imediatly after that dialogue goes explorer.exe sky rockets :(