Like Stephen, I too use Malwarebytes as my anti-virus program to get rid of viruses and trojans, but sometimes even it fails to locate the problem. I don't know a lot about computers, but I have learned a lot over time through trial and error and from internet forum chats. I had one particularly difficult to remove trojan that only Spybot Search and Destroy was able to remove. You can go to the CNet site to download it for free. Be sure to run the scan as an administrator. I hope that helps solve your problem for good. I don't do a lot of surfing on the internet, but I still do daily scans rather than wait for problems to arise. By the way, if you use multiple anti-malware programs like I do, you should only have one running in real time for virus detection.