From Lavasoft:
With the ability to scan your RAM, Registry, hard drives, and external storage devices for known data-mining, advertising, and tracking components, Ad-Aware 2007 easily can clean your system, allowing you to maintain a higher degree of privacy while you surf the Web.

You can download Ad-Aware here.

Follow up:

Once the download is complete, click run. Select your language and continue.

You will come to the welcome screen, click next.

After Ad-Aware is installed, you should get this screen. Make sure you go ahead and update your software.

Click scan now to run a scan.

After the scan is finished, you can now remove the infections.