Well, I got a little frustrated for awhile there. I uninstalled everything and did the whole process all over again... and it works just fine now. I'm not sure why it did not the first time. The vista system works fine. Now that I think about it, I don't believe I have played any games on that xp system since the last time it had a reinstall of windows, so there may have been some unrelated problem with that system as well. I appreciate the info.