Used to use Vista x64, now I use Mac OS X.

I Use Windows Vista

I do to, i'm wanting to switch to windows 7 though.

Windows of course. But I think of change my operating system. My friend said my, that Linux is the best.

I use xp sp2

i have Windows Vista Home Premium i wish i still had my XP Service pack 3 but vista has some good stuff in it

I used Windows XP, but I use Windows Vista now... a little bit more visually appealing, but not much better. I also use the Windows 7 RC, which is showing a really good effort by Microsoft to reinvent Windows. I use Macs @ school, but I don't really like them all to much... @ least not enough to switch (I am primarily a gamer, so...).

I also have used Linux, and one of my friends uses it as her main OS. It's okay, Ubuntu is the best of them... but I don't see many people jumping on the train or it really skyrocketing to success.

Mac OSX Leopard forever (until they release a new OS of course ).

Windows XP SP3 & Windows Vista SP1

Vista.

I prefer XP tho.