"The most effective, yet disruptive, way to rid a computer of spyware and adware is to format and reinstall.
Next, I would try using the free solutions and tools that are already on most Windows machines.
Go to Start > Run and type in ""mrt.exe"" to run the Microsoft Windows Malicious Software Removal Tool. The title bar for the program should have a recent month and year in it to let you know it has been recently updated. Select ""full scan"" and let it do it's job.
You may also have Windows Defender installed. Run it.
You you might have Microsoft Security Essentials, a free antivirus tool from Microsoft. If not, you may search for and download it.
Lastly, visit onecare.live.com and click on ""Safety Scanner."" An Active-X program from Microsoft will scan your computer for malware."