It sounds like all your installed programs are still there after you upgraded to Vista.
If you don't use them, uninstall them.
If you want just Vista installed (it's called a clean install), then you'll either have to get a full version (not an upgrade) of Vista or an OEM version.
You can use a Vista upgrade disk to do a clean install, but it's a very lengthly process.
Basically, you will have to do a clean install of XP, upgrade to Vista, then boot again to the Vista upgrade disk, and then it will allow you to delete the Vista partition for a clean install.
Good luck!