Aporte original por: rj713 ,
Before I did anything else I would buy a good antivirus and run it from the DVD. I sounds to me like you have picked up some malware and need to have your drive cleaned. Please don't use one of the PC repair items from the internet--they are mostly scams. After you run the antivirus do a safe boot and instruct the computer to repair itself. Finally are you sure there is not a hidden sector on your hard drive with the operating system on it? See if when you safe boot if there is an option to reinstall your software. Good luck.