Try this freeware.
GiPo@MoveOnBoot
Copies, moves or deletes files and folders on the next system boot. The utility is very useful when the user needs to replace or delete files which are locked by other applications, loaded into the memory or just cannot be changed until next system boot.
_http://www.gibinsoft.net/gipoutils/bin/moveonb.exe
If it still comes back, you have a phantom file that keeps regenerating your problem file. "HiJackThis" may identify it for you. You can always try System Restore.
Good luck!
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