email link and IE windows

I have several users who are complaining when they click on an email address on a web page, several IE windows open up. They will click on the X to close them and most of the time the web page that comes up page can not be found.

These users are using Windows 2000, IE 6 with the current sercuity patches, Outlook 2003.

I have gone in to Tools/Internet Options/Advance and click on Restore Defaults. That worked when I had users who would click on a web link in an email message and IE would open several windows. I thought doing that would solve the problem with clicking on an email address on a web page, it did not solve the problem.

Any Help would be greatly appreciated.

Thanks