Windows won't allow folders to be deleted
I'm sorting a lot of my files out at the moment and restructuring my directories. Quite often when I come to delete a folder Windows won't let me, saying that the folder is in use "by some other application". Generally the folder is completely empty, and no other applications are running. The only way around is to restart the computer then delete the folder.
Any ideas why please? (I'm running Windows XP, which BTW is crap and keeps crashing)