|I agree that you may have a virus or for sure a malware of some kind.|
I have made live cd's that have ways to do restore points or antivirus or antimalware but might have to make one just to get this out.
I'd try to boot to safe mode. Do complete power off and then power it back on. Just after you start to see words on screen you can press F8. It should allow you if you timed it right to go into safe mode. I'd try a restore point first.
If that worked then get a good security program to help protect this. Use limited user accounts too instead of an admin. account.
Don't be fooled by internet crooks.
Get a good hosts file too.
1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.