I'm just wondering, too.
What's the difference between 32 bit and 64 bit?
Is the difference on proccessors or on OS?
I have read some articles about them, but I don't really get it yet.
You need a 64bit compatible processor to run a 64bit Operating System. However, you can use a 64bit processor to run a 32bit OS as well. It allows, among other things, a person to use more memory, as Bradan said.