Haven't checked the ComboFix log yet, but have you tried TDSSKiller?
TDSSKiller and save it to your Desktop.
http://support.kaspersky.com/downloads/utils/tdsskiller.zip
Here's an article if it helps.
Google Hijack" - Google Search gets redirected
http://www.experts-exchange.com/Virus_and_Spyware/Latest_Threats/A_3299-Google-Hijack-Google-Search-Gets-Redirected.html