Despite running the latest Service packed versions of Windows 8 with UAC, Windows defender, Microsoft Security Essentials along with Firefox 6 + updates, my computer became infected with a Trojan from a website which made nearly all the files on the HDD Hidden. Then Ads kept popping up for a fake AV application.
I have a removed the Trojan (I think) but my Firefox browser search has been hijacked. I have disabled all addons, ran Hijack this, Malware Bytes, the USB linux based AVG scanners and several commercial online viruses scanners which find nothing. How can I track down and remove the hijacker which I think was installed by FakeSysDef?