Heh. Not sure I've heard of "Ultimate" but I do have Win 7 "Professional".
I'm actually thinking of sending the computer back to TigerTronics at this point. I have the exact same computer at home, and I bought the one having problems for my girlfriend for her work. I even took her printer home, tested it out on mine, and it worked fine. Mine had no problem installing the games, and hers can't seem to get them to work even after turning games off, rebooting, and reinstalling. Also, it seems to have a problem recognizing allowing other network computers access. Mine is the exact same one and it has no problem with all these things. They're refurbished HP DC-5700's, 3.4 GHz processors, 2 GB RAM, and Win 7 Professional on each. Little speedsters. BUT, one works fine, and the other can't work with ANYTHING without some sort of a hiccup. I'm starting to think that the one having problems probably has something to do with the reason WHY it was probably sent back by whoever had it previously in the first place.