I just installed Vista Ultimate this week, and I've been using it as my main OS. It has it's quirks and glitches every now and then, but as a whole, it seems to be working alright. However, on the 2nd day, I went to plug in my USB flash drive (SanDisk 1GB Cruzer Micro) into a front USB port - and before I could even get the drive in the USB slot, Vista locked up. I don't mean "locked up" as in everything froze...I mean "locked up" as in both of my screens went blank, my music stopped, and both my USB keyboard (Logitech G15) and USB mouse (Microsoft Habu) were unresponsive. The only course of action I could find was to hit the Reset button on my machine.