XP. I don't want Vista, and I can't get 7 right now.
Somebody gave me a Mac, but it has a slightly old OS (Mac OS X "Panther"...Update 10.3.9). The thing is, with Apple, it might as well be ancient.
I can't run Adobe Flash Player 10, because you need at least OS X 10.4. I can't update iTunes or Quicktime because the OS is too old (for the record, it is no older than Microsoft's Windows XP, yet I can update everything on that OS).
I would update to Snow Leopard, but I don't think it's worth it, because worst of all, I can't connect to my wireless network because I don't have an AirPort network, it's just a D-Link network, which works fine with my other computers.
I hate Apple; they make you keep paying in order to use the latest things. [sub]I still use their iPod though.[/sub]
So that was my little rant...Good day.