There is a registry item that needs editing in REGEDIT for this. As someone said the virus is not destructive but when removed using AV Scanners (Kaspersky here) it leaves this annoying 'error'
Start - Run - type "REGEDIT" and browse in there for:
Hkey_local_machine...software...microsoft...windowsNT...cure ntversion. Once there, search for dust.exe and it will select one of the entries. Double click (or right click - edit) this entry and remove the dust.exe leaving only explorer.exe in the box.
Let me know if that helps.
Ian B