SP 2 Will not uninstall

[blazer003]

I installed SP2 on XP Pro a few months back. It has been giving me fits with 2 of the main programs that I use, and I'm ready to go back to the way it was before. However, I go to add/remove programs and click Service Pack 2 and uninstall and it tells me that "Uninstall could not find the SPUNINST.INF file." I can't uninstall any of the ways Microsoft suggests. I haven't tried system recovery, but there is a lot of stuff that I don't want to lose if it goes back to how it was months ago. I tried reinstalling SP 2, but it said it was installed and that I didn't need it. Can anyone give me some help?

[icecube]

It might just be easier to fix the two programs that aren't working right. Describe what the issues are.