HighJackThis (that is how it is spelled, all one word) isn't a site, it is a utility program that, when run, will show you all of the services and programs that are currently running on your system. It will automatically create a "log" file if allowed that can be sent to specialty sites where people trained to deal with them can advise you what to remove. Since in your case you've already run the necessary scans (ad-aware, spybot, etc.), it should be relatively simple to locate any "stray" entries that should be removed.
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Those items that are identified as "bad" can be selected and removed, including their registry entry.
HJT will usually find the type of hidden nuisance popup that you're dealing with here. If not, then we know we need to get an even bigger weapon!
As stated above, you can download the program from my site, via the Spyware link. This program can cause a ton of problems though if things that should not be removed are tampered with, so it is suggested that it be run only by or under the direction of an expert.
Here is a Google search result page with addresses of sites where you can upload the log page:
Google search The TechSupport site (first result) and the Lavasoft site (third result) would be good choices. I'm sure there are others, though I only looked quickly at these results. And as stated above, I can do for you, too, either "live" or via email. Be cause of the size and complexity of these log files, I don't usually recommend uploading these logs here a AP, though that could be done, too.
Dwight
