when i was in eighth grade i was learning how to skateboard and started going down a huge hill. i was going crazy fast and i started to get the speed wobble of my skateboard. then my board hit the wheel which made it instantly stop. i ended up rolling twice and having the rest of my body in the air and only my face dragging across the pavement for a bit. my brother and some friends were behind so thats how i know what happened.
i got up and my entire face was covered in blood. i also ended up shoving my bottom teeth into my lower lip creating a nice flap of grossness. took a long time to heal but now it made me more beatutiful. lol
i just upgraded to win7 a few weeks ago from xp. everything works fine so far. you can dl the windows update advisor so that you can see what won't work with the new upgrade.
i say get 64. if you're going to upgrade eventually, you might as well.