Do you use the free version of Spybot? Malwarebytes and the free version of Spybot won't protect against viruses, so if you don't have the paid version of Spybot, you may want to download Microsoft's Security Essentials which is a really good free anti-virus program. That said, I recommend updating Malwarebytes and Spybot, then rebooting into safe mode and doing a full system scan with each of those to ensure that you don't have any mal/spyware on your PC. If that still doesn't take care of it, download the Microsoft Security Essentials and do the same with it.