Stop messing around with Windows. Get a Mac.
The
MacBook is all you need.
Little or no virsuses, malware or adware to worry about - that's huge compared to XP.
Lots of great software built in (
it's called iLife)
OS X is a great OS (especially Leopard aka OS X 10.5) and it plays perfectly well with Windows networks.
If you just want it to work, buy a Mac.