For this type of virus I would suggest downloading Hijack This! -
Run a scan of your system and copy and paste the logfile into this website -
Things that are marked with a red 'X' on that site should be removed viva HijackThis! I find that this program finds a few things that Anti Viruses don't even pick up, as this program reads programs that are being run in the background and doesn't scan files etc.
That .EXE file should show up in the scan if it is running in the background of your computer and it should be labeled with a red 'X'. Find the exact name in the HijackThis! program and check mark it and hit fix. Remember, find the exact name! You don't want to delete a .EXE that window's uses to keep it running up.
I think I should make a Guide Thread on "How to Use HijackThis!"
This is the second person with this type of problem that you can solve with HijackThis! in the past 3 days T_T