Spyware Ads planted on my computer.

While traveling throught the Internet, a “Spyware Detection and Removal” Company has planted itself, permanantly it seems on my computer! I’ve run my McAffe, AND Windows Defender and found nothing. Now every 20 seconds, I get a Spyware Detected, followed by a “Buy It Now, and Download it Now” ads as well as a permanant yellow message that links to “Anti-Spy Storm” and “SpyMaxx”
Can someone help me figure how to remove the obnoxia from my computer?
If there is ever a class action suit filed on either of these two, I will gladly join it!
Michael A. Bailey