The compatability mode feature that someone mentioned earlier solved almost all of those problems for me when I upgraded to XP...I was able to keep almost all of my old software, and I can now run some software that I previously couldn't use, because it was for Win2000/NT. Very cool.
My only unresolved issue is that there is no XP driver for the sound card in my old Gateway laptop...I have to use an external unit. I can't get any help from Gateway or the Windows people or the sound card manufacturer...everyone just says "Well there's no driver for it...maybe it's time for a new laptop?" That's a lot of help.
So I'll just stick with the external one. It's a better soundcard anyway.
Mike