There are two free anti virus tools that can help remove unwanted viruses and malware:
Avira is a CNET editor's choice and is a must for anyone that is looking for a free antivirus solution.
If your problem is malware, I suggest that everyone download this free program. It saved more than one PC in my household. I suggest doing it in addition to the Avira. Many new malware viruses prevent you from downloading anti adware and malware software after the fact.
This is one of the best programs out there. Even the Norton service I pay for failed to clean up the computer's registry as well. This a free anti-malware tool. It is also a CNET Editor's Choice (2009)