BTW, here is an interesting link:
http://www.lindersoft.com/forums/showthread.php?p=10385
And if you don't know which file was locked, just check the following:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Session Manager
entry for PendingFileRenameOperation
There you will find the name of the "locked" file(s).
If you need more help, just let me know.
Friedrich