Hi
This doesn't sound like any Windows update that I've seen, so it may well be some kind of malware.
This is why everyone should gave a system image.
If this a laptop?
Does it have a recovery partition?
You may have to reset it to factory specs.
But don't do it until we see if someone else has a better option.
If you do, have to reset it to it's original condition, create a Ubuntu disk and boot your computer to it, this will let you copy all of your important data off of the drive before restoring it.
Take your time and be sure that you get everything.
http://www.ubuntu.com/download/desktop
When you get it running again use something like EaseUS TODO Backup to make a system image.
Mike