- You're having a quiet vacation and need something to do.
- You're getting bored of the stability of Windows XP or your Mac, and want to try something more challenging. You like an interesting OS that keeps you guessing what will happen next, or you miss the fun of lockups and reboots you used to have with older versions of Windows.
- Your current computer is running too fast, not giving you enough time to make and drink your coffee.
- When you try to run a program, you'd like your system to ask you if you really want to run the program.
- You'd like to have Google desktop, but don't want the bother of installing that free program. Plus, the Vista version has a picture puzzle you can play with.
- You need an excuse to pay to upgrade to the latest version of your programs (otherwise, some won't run on Vista).
- All your friends are will laugh at you if you stick with XP (actually, they're jealous).
- You've got to have transparent menus and windows (though for this, I think, you'll need more than Vista Home Basic ... so be ready to pay a little more).
- You need a way to use all those dozens of gigabytes of memory you have installed on your new machine.
- You want to show Microsoft your support and appreciation.
(BTW, don't tell me to try Linux. I've got that installed also, in the Ubuntu flavor, but I still have too much invested in software and experience to abandon Windows.)