So far as has been reported here, it is unlikely that the popups you are seeing are related to mudcat.

The are numerous ways that you can "acquire" scripts that can initiate popups on your machine. Since they are generally NOT a virus, it requires something other than standard AV software to block them. Some of them, if they manage to get themselves on your machine, will "pop up" at random, often when you change web pages (apparently an attempt to make you think it came from the page you just opened?).

You can run AdAware to remove some kinds of Adware/Spyware, but it does not normally block the download of such stuff on a "real-time" basis. When you visit a site that "offers" one of these pieces of crud, it may be downloaded to your machine, and AdAware cannot usually prevent that from happening. (There is an AdAware setting for "real-time guarding," if you have the "paid version;" but it's not terribly effective.) You MUST run AdAware periodically to remove any such crud you may have acquired, and if you want any real "protection" you need updates to the "signatures" that AdAware looks for about as often as you update your AV software and signatures.

There are a few ads posted at mudcat (by Google) but these are just "inserted" on the page you're looking at - not popups in any real sense.

While it's not impossible that an "infected" page might find its way to mudcat, there have been no reports of anything of that sort here. The most likely thing is that you "acquired" a script that is running on your machine, that just happens to pop-up when you change pages. Sometimes just clearing unwanted cookies and deleting your browser history will get rid of the less obnoxious of these. Running AdAware may remove more nasty ones. Occasionally you'll run into one that requires a different removal, so you might want to add Spybot to your tools. Others may recommend different cleanup tools.

Of course, while you're cleaning up, you'll want to update your AV signatures and do a full scan there too.

John