If you have reason to suspect it is some sort of virus/malware/spyware/adware, try MalwareBytes from
www.malwarebytes.org and Hitman Pro 3.5 from
http://www.surfright.nl/en. Malware Bytes is free for personal use and Hitman Pro has a 30 day trial.
Otherwise your options are probably as I listed them in my previous post. If you would like to give some specs on your system, as well as what you use your computer for, someone might be able to point you in the right direction.