There are a couple of things I would try. Both are easy and can fix a good number of problems. Download and run MalwareBytes and SuperAntiSpyware. Do a full scan with both programs. If they catch anthing be sure to go in and delete the virus programs they found from the quarantine area. Both programs are free.

http://www.malwarebytes.org/mbam.php

http://www.superantispyware.com/download.html