|I agree with #7, BUT, as your s/n suggests....you possibly use it for business so I would suggest Avast Pro in that case, for the extra features and protection.|
Sounds like you are infected, so try these FREE progs in the exact order listed:
2- tdss killer
3- malwarebytes (download the latest version which is on the right side of the page...IGNORE the ads on the left side)
Do NOT reboot until AFTER the last scan. If that fails to work....try it again, only this time do it in Safe Mode.
Some HELP in posting on Computing.net plus free progs and instructions 7 Golds