Yes, I downloaded those, but they don't do the trick for me. Also, I downloaded all updates for XP, nothing happened. So, it might be the third option, IRQ conflicts.
Now, I've changed back to 98SE. Unfortunately, something weird happened. I had made NTFS partitions with the XP installation program. When I booted the computer with the 98 boot disc, and typed format c: (Yes, I really did, I checked it at least twice) it went on and formatted d:. This was probably because fdisk had some problems with the NTFS partition, which was to be my primary DOS.
Formatting D was not what I wanted at all. I lost all my important documents for work and school, also about 10 gigs of other fun stuff that I'd really love to have back. I tried some lost & found programs, but none of them can restore everything. Well, well. Good thing I have a nice connection so that I can restore most of it.