Holy crap, I can't believe how many people still use Microsoft OSes.
I moved over to Linux and installed 2G of RAM into my machine. It's gotta be the quietest OS I've ever used (besides DOS). The hard drive barely makes any noise, and I can't even tell the computer's running. It took some time getting used to that.
Oh yeah, and apps load 10x faster. I will NEVER go back to Microsoft.