So how do you make sure that your computer is ready for the edition of Windows Vista?

The Windows Vista Upgrade Advisor will help you to determine if your Windows XP-based PC can run Windows Vista. You can also use the Upgrade Advisor to determine if your Windows Vista-based PC is ready for an upgrade to a more powerful edition of Windows Vista.

There are also some tips posted by Computerworld:

Microsoft's new OS is saddled with problems that may dissuade would-be upgraders. If you do decide to upgrade, though, it's easier than ever before. Here's the smart way.

Upgrading to Vista: The Gotchas and the Good News