Since it seems people are still being either fooled or unable to stop the evil falsehood trojan in time, I want to make sure people know about it. In a time of 3 months, even after warnings about it verbally, about 6 people I know have gotten it. >.< So, I'm trying to spread the word. (I got it 3-4 years ago.)
You'll have something pop up on your screen that says you have a virus detected, or that your antispyware isn't working etc. Depending on the one, it either begins 'scanning' your computer, or waits for you to give it the 'okay' to. When you see this pop up, IMMEDIATELY close it! If you had walked away and come back to it,close it. Then, if your virus protector hadn't already started getting rid of infections, scan your compy.
If it has already gotten to the point that it's fighting your internet or won't let your virus protector open, sometimes they make programs that will track and destroy it slowly, until you can get your virus protector working. These work because they randomly scan parts of your computer, but not fully. That way, the trojan doesn't catch on and shut it down. I know, that sounds weird, but that's basic programing for some. But, that's why it is also a slow process, because you have to constantly run it to do that. If it gets too difficult to even run, then it might just be best to back up what you can and start all over again.
Another way, sometimes, is to system restore. Though, it tends to block that option.
The Vundo trojan, and one of the most popular to get link:
en.wikipedia.org/wiki/Vundo