First, you need to be more explicit when asking questions so people can help you... specify operating system (Windows 98, Windows XP, Windows ME, Windows Vista, Mac OS 10, etc.), also which browser you're using. Saying you switched "it" to pop ups OK doesn't tell us what "it" is.
The address in the message and its text suggests you're using Internet Explorer. Others who have gotten the same message have fixed it by going into IE Add Ons and disabling all Browser Helpers. If you're on Windows XP SP2, go to the Manage Add Ons dialog box.
You should also consider doing the following since it's possible you've been infected with malware:
1. Switch to FireFox for everyday browsing. You're less likely to get infected by malware this way. It's free and you can download it at:
Mozilla | Firefox web browser & Thunderbird email client
2. Run an antivirus program; a good free one is AVG which you can download at:
AVG Free Advisor - Free antivirus and anti-spyware downloads
3. Run adware/spware software at least once a week; I recommend both Spybot S&D and AdAware (they tend to catch different things); both are free at:
The home of Spybot-S&D!
Ad-Aware @ Lavasoft - The Original Anti-Spyware Company - Lavasoft
4. Run Windows Update from the Start menu at least once a week
If you do all these things, you'll greatly reduce the probability of future problems.