Maybe try a tool that normaly delete every file you want. I don't used any of these, so use them by own risk.
Seems to bee similar tools.
DelinvFile - Delete Invalid Files and Folders:
http://www.softlist.net/program/deli...-download.html
Unlocker:
http://ccollomb.free.fr/unlocker/unlocker1.8.7.exe
KillBox:
http://www.bleepingcomputer.com/files/killbox.php