If you can boot into Windows and have an Internet connection download startupcpl from MIke Lin's page
and install it. This will give you a new icon in your control panel named 'Startup'. Run it and go to the RunOnce tab. You should see the link. Delete it and reboot.
The only other way to do this would be run\regedit and do a search for 'Runonce' and delete the entry from there.