I am still running Windows XP Pro, I have a few reasons why. First of all I tried out Vista and threw all of it found a ton of stuff to annoy me like the administrator starting of more then half of the programs I ran, it gets annoying having to set that up for almost all your programs, not to mention the ones that don't like that setting and turn it off for some reason(heard they fixed that little bug). Second is the money, I would of went to Ultimate but couldn't afford and was sort of waiting out the next OS implementation. Then we come to some of the games I played didn't work on Vista when I was using it so that was the biggest factor for me. Though as of now they have fixed most of the stuff I ran into, minus the problems that were a part of my Pack of Vista I was using which were there for a reason... So all in all if I now had the money, well prior to Windows 7, I would of probably went up to Vista Ultimate. I will have to say XP Pro is treating me pretty well minus not being able to take gear of my DX10.1 compatible video card. Though something I've noticed with windows releases on there OSes we have 95 which blew chunks then we have 98, we have ME then we have XP (Well we had 2000 in the middle of those but that was initially intended to be a corporate release.) Then we hit Vista and now it's follower 7. Though I figured due to 2000 and XP following each other and breaking it that 7 was going to fail also... then I got reminded that 2000 was initially intended a corporate release. So it is an ongoing pattern with Microsoft, release a shit system to make money to make our next better system.