Browser Hijacked Fixed
Usually if your browser is hijacked you try to remove it using the TDSSKiller. Once you scan and you saw Malicious File cure it, if it shows suspicious file just skip it.
Additional Security tips for hijacked browsers.
So once everything is cured, remove the TDSSKiller from its location.
Select new restore point so you can have a clean timeline
Check windows update website for updates, it will be your 1st line of defense
I recommend you use MBAM or Malwarebytes Anti Malware. It scan or find most active malware in your system
You can download Secunia Online Software Inspector - this software generate reports about majority infection in your pc. Most infections are not OS problem but acquired through application likce quicktime, java, pdf, iTunes etc.