Photoshop 4.0 LE Problem

When I start photoshop LE, it comes up and then another window comes up and says "Adobe Photoshop has encountered a problem and needs to close. We are sorry for the inconvenience...." blah blah blah. Tells me to send an error report [which I've done multiple times]

It was working fine until I start to have other windows open with it. Now it won't work with or without other things up.

I reinstalled it, it worked fine until I clicked it by accident while having some internet pages up. It started doing this again. I tried to reinstall it, it worked once. I tried it a few hours later and it started with the problem again.

Any ideas? I have windows XP, so could it be that the version is too old?
Thanks :)