Can you do a system restore to a date previous to when you got the virus?

I had one similar to MoonandBeam's about a month ago - said I was infected with a trojan virus and click to scan to remove - and I hadn't even opened anything in an email. Must have caught it from some website, but don't have a clue since I am super careful where I go. I couldn't get anything to work, and a porn site kept popping up - I thought I was toasted for sure.

My son did a system restore back to Jan 1st, and that took care of it. Now everytime this puppy gets a little slow or acts somewhat funky, I get paranoid about it, thinking something is lurking in here. But, so far, so good, and no more problems. This is just another reason I stay away from the social networks.

Hope you get rid of whatever you have!!!!!