@anon970297: You poor thing. You stumbled right into a ransomware virus. Do *not* pay the organization money to "unlock" your computer. That will just give them your financial information. You'll have to do a system restore. But it will *not* let you do one from the control panel. You'll have to do it from a command prompt in safe mode.
Here's what to do: First, turn your computer off and restart it in safe mode with command prompt. When you see the command prompt, type in rstrui.exe and hit enter. Then choose a system restore point before you ran into the virus. The computer should restart and be all right.
After you have it restarted and up and running, then run every antivirus and anti-malware tool you've got. Get rid of anything that looks remotely suspicious.
Keep an eye on your computer for a week or so. If it does anything odd, run the AV and malware programs again.
My husband ran into one of these on a Reddit page. Stay off that site -- I'm serious. I did a system restore and it solved the problem. But God, those ransomware viruses are damned nasty. Good luck!
P.S. You didn't do anything wrong. You just ran into an infected page.