Calmly explain your problem. Type in complete sentences and use some
punctuations. ;-)
I guess what you are saying is that on your Windows XP (Home? Professional?
Media Center? Other? & SP1? SP1a? SP2? SP3?) machine - you have Internet
Explorer (v6? v7? v8 beta?) installed and Firefox (1.x? 2.x? 3.x?)
installed and one is working (surfing the web pages you wish to visit -
whatever those are) and the other is not.
Internet Explorer gives you some error (would be nice to get the exact
wording) while Firefox works fine?