the only reason id get windows, is to use MP!L caws patchou hasnt realised that windows is crap yet
but the amount of free alternatives to most programs for windows is enormous! and [usually] if you get linux/ubuntu, it comes with an emulator called wine, which runs some NOT ALL windows programs.
its a hackers favourite too =p and there's no known viruses/worms because of the way linux was made. so its pretty secure too. id recommend it, and if its a good pc/laptop get Beryl. youtube it.