That is a real nasty one.
Can you do a scan outside the windows environment? Kindly refer to HELP!Virus redirects to spam sites and other stuff
post it contains some relevant information you may want to consider.
I see you used the Flash scan of MBAM. Have you did a full scan?
ESET Online scan, HitmanPro, RKill, Dr.WebLive USB/CD..etc are mentioned in that particular post. Can you consider that also?
Do you have a clean system image backup? If yes, then you might wanna consider recovering with it.
Or as mentioned, you can consider:
If all else fails, well, consider doing as stated by StalKer
in that particular post
Then re-install windows.