In which case, Im guessing McAfee has found and removed a Vundo file but left the Run key.
Vundofix has been withdrawn for the moment while atribune tries to resolve a bug, but run this and see if it gets anything. It has proven to be decent against vundo, but the only way to properly remove that critter is to search for all it's files and regkeys.
http://www.brothersoft.com/download-malwarebyt es.-anti-malware-71406.html
Bear in mind, I cant be totally sure this is the case without having real info to work with but running a scan wont do any damage.