Give it the ole' 1-2-3 punch first and see if it goes away.
Download these three apps first:
Smitfraudfix, it works in win7:http://majorgeeks.com/SmitFraudFix_d5360.html
Combofix, it works in win 7 also:http://majorgeeks.com/Combofix_d6402.html
Choose free version.
Now go into Safe Mode with Networking and start with Smitfraudfix...follow the prompts and let it update if it wants.
Next run Combofix and follow the prompts, let it update too.
Last run Malwarebytes by installing it, update it and run it.
If at any time you are required to reboot to finish an operation, make sure you go back into safe mode with networking to finish the rest of the apps.
I find these apps kill most malware on your computer if you follow these simple instructions above.