I like XP Svc Pk 2. I've used NT, 2000, Me (a nightmare!), and XP.

Here's a reality check:
My dad was shopping for a new laptop. I warned him about Vista. When he asked the sales guy about it, the guy said that 1 GB is needed to at least run a Vista operating system without locking up. This meant, then, that their inventory of 512MB laptops w/ Vista were useless.

If the guys at Office Depot know this kind of stuff, why the heck doesn't MS or the computer manufacturers who are installing it?