I don't know what's happened, but whenever I try to go to facebook it keeps coming up with a Yahoo page that says that the page is not available (a couple of times it brought up a Bing page). I've run a full system Norton antivirus scan (with all my definitions/etc up to date). A full system Malwarebytes scan and a full system can using TDSSKiller (backdoor rootweb scanner). It's not flagged anything unusual - everything's fine. This has been going on for two days. I can log in fine thru my laptop, but not this pc. Can someone please help? Thanks!
p.s. I am using Internet Explorer 9 and NIS 18.6.0.29
This seems to only happen when trying to get to Facebook, no other sites.