I have four browsers on my computer. They are:
- Internet Explorer 8
- Mozilla Firefox
The default browser is Firefox. My problem is that sometimes the other browsers (except Firefox) will not load any pages.
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.
There's no inherent problem with having all 4 of those browsers installed; all are separate programs and (theoretically) shouldn't interfere with each other. Try reinstalling one of the 3 problematic ones to see if it starts working.