IT guys, please help. Somehow I cought a virus

Well, as several of you know. My computer was stolen a little wile ago. Well it was recovered and I have been using it with no problems for the last few days until tonight. Now all the sudden it is trying to get me to buy AV security Suite and keeps popping up all sorts of warnings. I have been looking online for ways to get rid of it and I found a website that gives you instructions, but I am a little worried about it too. That website is geekpolice.net. Have any of you ever heard of them? Are they trusted? Anyway. I am a little upset about this as nothing really works. I can't open I-tunes, I can't do allot of things. Lucky for me I did happen to find a way that will let me serf the net, but I get tons of warnings. Anyway, here is a link to the instructions to get rid of the problem.

http://www.geekpolice.net/malware-r...ve-av-security-suite-removal-guide-t21929.htm

Thanks in advance.

Jeremy