I beleive this is strictly a IE6 problem or SP2, cos I have experienced this same thing on and off since I upgraded to SP2. I periodically have to go into file types and click on transfer, gopher and hyper text protocols under IE6 and reactivate them. It is the same thing on my husbands computer. Sometimes when I click on a link or something from within a program it will bring up my browser and go to the page, but at the same time a warning pops up saying windows can not find the url, make sure it is corect. I have become use to it now.