Use AIM? Read this.

I kept finding these irritating popups from something called "Viewpoint Media Player" that weren't associated with a browzer window. I found a process that was called something like "viewpoint manager" and killed it; this took out the popups, but it was coming back up when I rebooted my machine. Did a websearch for it and found the above website. Ad-aware doesn't catch this one. But it is easily uninstalled from the control panel.