Periodic W2K Freezing (not bad, just annoying)

[Tomado 0]

OK, this isn't a really big problem since W2K still runs fine and doesn't crash but I am having a very annoying problem: W2K periodically freezes. This is solvable by pressing alt+ctrl+del then pressing the cancel but I would like to eliminate this annoyance. It only happens when I go online and use IE5. When it freezes, I can still use my mouse and my keyboard and IE5 is still loading pages but I cannot click on the IE5 to go anywhere or to minimize the window. I can still press the Windows key on my keyboard but I can't click on it with my mouse to open the Start Menu. I usually solve this by pressing alt+ctrl+del and then pressing cancel but I have to do that one time too many and its really getting on my nerves. What could possibly be causing this??

Thanks!