Internet Explorer constanty switches to Firefox

Hi,

I’ve had this problem for a while, but as I don’t typically use IE, it’s not been problem. I have found nothing searching the web for solutions, but I can’t believe that I’m the only person this has happened to.

Whenever I type in an address in IE and press enter, a window opens up and Firefox pulls up the page instead. If I click on a Java link, same thing. The only time IE does not do this is when I click on a normal link within an IE page.
Any ideas on what is doing this? I’ve reinstalled Firefox and IE, to no avail. IE is set as the default browser— no help.

I’m running XP SP3.

Thanks in advance!