Try booting to "Safe Mode with Networking" reached by tapping F8 while booting up and picking the second item on the ensuing menu.
Do ALL of the following in that mode.
Download and install the FREE version of THIS tool, update it and then run a full scan.
Reboot if asked to and they should be gone.
If not, post a Hijackthis log on one of the following forums for expert guidance:
Do not post Hijackthis logs here, we can't help with those!
Post the logs at a specialist Forum:
Be sure to read all the sticky announcements/instructions at the top of each malware forum!