I had the joy of dealing with this nasty virus a little over a month ago on this very laptop. I dont know how I got it...I did not download anything but somehow woke up that morning, booted it up and there it was! I would click the x to close it and a few seconds later... another warning would pop up. After about 15 min of trying to see why my virus scan (MS Security Essentials) wasnt catching it, I shut it down, went to the desktop and downloaded Malwarebytes and put it on a USB stick. I then booted the laptop back up in safe mode and installed it and did a scan. This took care of it and I havent had an Issue with it since.
I had a friend from school who wasnt as fortunate with this same bug. He had apparently been trying to continue to use his laptop despite the virus for a while and I gave him the Malwarebytes and it said it got rid of it but when he rebooted normally, it was still there. I recommended the SUPERantispyware and havent heard if that helped better.
It seems that possibly the longer its on your system, the more damage it does???