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My guess is that it's probably happening in IE (but not Opera) and that a program like Adaware would probably get rid of it.
This may be one that spybot will not remove completely by itself yet. I have seen some as of late that will go out through the internet and reinstall themselves after spybot supposedly removes them. If you know windows well you can see the processes sometimes in process manager and selectively kill them before running spybot. Also sometimes there are hidden files, dll's and registry keys to remove that spybot can't find yet. If so you will probably end up needing to download hijack this and posting the output into a tech scumware forum for specific help.
You might want to install a firewall after cleaning up your computer to see what programs are trying to access the net without your knowing it. I use Zone Alarm, it's free and has worked well for me but there are certainly other great programs out there too.
Also, avoid file swapping programs as you have an open port with them. And last but not least, when you do install freeware, DON'T use the "typical" installation because THAT'S WHERE you run the risk of getting the spyware. Customize and reject everything that gets added on to the original program.
Hmm...sounds almost like politics...