I use Windows 7 Professional 64bit. I really can't be bothered with Windows 8; doesn't appeal to me at all. If I wanted a tablet-looking interface, I'd buy a tablet.
[MENTION=2]Lauren[/MENTION] use this http://www.stardock.com/products/start8/ what we recommend in work for those who prefer the start menu to the new interface
I'm not bothering with Windows 8 right now. I like 7 just fine, and I haven't liked 8 whenever I've tried it on someone's computer.
I'm debating mucking around with Linux so I can learn more about it (I have a Knoppix live-boot disc lying around), but my hard drive's getting pretty filled up and I don't currently own an external drive; I don't want to partition off what precious little space I have left at this point in time. ;-;