This infections can be difficult to remove it as it stops AV and removers running. If you logout and login as a different users (or different profile), then it may not present itself, but AV’s don’t locate the infection.
So the solution:-
1. Browse to “C:Documents and SettingsAll UsersApplication Data”
2. Delete the folder name F4D55F3B000149735AFDDC61D151FC4E” (Hold Shift + Del – this will delete the folder without moving to the recycle bin first.)
3. Restart PC and run a virus scan using Microsoft Security Essentials/AVG/Malwarebytes
You should fine this removes the infection and you should be fairly clean, you may want to run a few scans.