Pop-ups and Banner Adverts

[TommyB]

It seems I have aquired some Malware of some sort over the past few weeks. It causes pop-up windows titled "Advertisement" to come up. This malware also causes a strange banner to appear at the top of some websites, with a URL similar to hxxp://pop1.2z0o.net/****, although the banner does not load and stays as a white rectangle.

I have blitzed my computer with WinPatrol, Spybot S&D and Ad-Aware, with no luck at the moment. If anyone knows of any fixes for this problem please let me know.

Thanks in advance,
Tom

PS: I am running WinXP SP1 and have my HijackThis log at the ready if needed.