Internet scareware fake antivirus prblm?

Install Avira Free and MBAM. Update each of them then fully scan with Avira first. These scans can take awhile so set it and leave it. When it finishes, it should tell you what malware it found (if you updated it before you started). Remove everything it finds and reboot. If you are able to reboot, scan with an updated MBAM. That should find a couple things Avira may have missed or not totally removed. Again, reboot. I would advise CCleaner to wipe out cookies, junk data, recycle bin, registry errors, etc. This last tool is not going to help you with malware but might help your system out a bit. Always leave an Antivirus (like Avira, NOD32, Norton, MSE, etc.) running to prevent things like this from hijacking your home page/system. Good luck! :)