I just started using a POS called AceRetail3000 in Vista and I am experiencing a lot of conflicts/problems. The company doesn't support Vista.
I tried removing Vista and installed XP PRO on the computer but I was missing drivers.
AceRetail IT said they have another person trying to run their program on Vista. This other party modified Vista by removing securities to allow it to run like it was XP.
Any suggestions?

Thanks

Best option would be to find the drivers you need for XP.
You could also try running XP in a Virtual Machine, like Parallels, Virtual PC or VM ware.