If you don't have it yet, you will in the future. One of the worst Popups around.
Get
Ad Aware SE It is the newer version of Ad-Aware and it is free. You need not purchase it either.
Also get
Spyware Blaster and
Spyware GuardI try to have at least 3 spyware programs on my computer.
On Edit: Sometimes, Malware/Spyware is unknowingly installed on your computer. Check the Add/Remove programs in the Control Panel to see if there is any foreign software on you computer. Examples include the Aurora Network, OLN, and othes.
2nd Edit: When you do get Winfixer, just PM and I'll give you instructions on how to get rid of it.