Yahoo search problem, possibly virus

Hey all this is my first post here. I am having trouble with yahoo search. On 2 of my browsers, yahoo has taken over. Everything i try to search is redirected to some yahoo search query that I didn't type nor have any consent of. I am starting to think it is a virus because even when i change my default search engine it redirects me to the same thing. I will post a pic of the problem. Also, it is effecting some of my programs by preventing them from connecting to the internet. I will post a log of windows 7 upgrade advisor where it shows the problem. Im hoping somebody can help me out. Thanks!

EDIT: Running virus scan right now.

Welcome
As you are already doing run a virus scan
If negative
Download and run a full scan with malwarebytes
If negative
go back before the problem with a system restore.
http://www.vistax64.com/tutorials/76905-system-restore-how.html
If you can go back 2 weeks before the problem to insure that the virus or problem is not in the restore point