Most of the time, a 32bit software should be able to work under vista 64bit environment with it's back-compatible ability, there are some cases that it won't work.

Perhaps you can perform file & settings migration under "System Tools". It will migrate your profile and selected files and setting to your new environment. I'm not that sure if you can perform from xp to vista.

However, when you do Vista Installation from XP, you should have an option to upgrade (which will also migrate your files/program) to Vista. Just insert Vista Disk after Windows XP is loaded and select Upgrade.