A quick Google seems to suggest it's Malware, have you actually run any scanning tools etc or just tried to remove it yourself? It may be getting replaced by System Restore, try turning it off, deleting, rebooting and turning it back on to see if that's the case. A lot of malware nowadays actually
tricks System Restore into backing up a copy of it :S
I'd recommend scanning the PC using at least:
Spybot - Search & Destroy
Ad-Aware
...and a virus scanner of your choice. If you don't have one then I highly recommend installing
AVG Free.
Hope this helps, if you have any questions then ask away
