Finally, I opened one of the folders on my desktop and hit "CRTRL+H" and got my History displayed on the left side of the folder content window. I noticed that there were "ad.yieldmanager.com" references under every sub-"folder. Once I deleted them, problem solved.
I had no idea where this history was coming from since it was not in an IE or Mozilla window. Found it under the following:
C:\Documents and Settings\xxxxxxxx\Local Settings\History
It seems that once ad.yieldmanager hits, it perpetuates itself in the History. Deleting those references should solve the problem.