I have a dual Xeon machine (3.06 mhz x 2) with 2 gb of ram and a nice video card. UT 2004 runs just fine. I installed U3 with no errors but when I try to run the program a windows error pops up and then shuts down U3 - doesn't make it past the splash screen. I'm running windows Xp professional with SP2. I also tried downloading the U3 patch 1.1 and it didn't help. Do I have to uninstall UT2004 to run U3?