If you like the Vista Welcome Center and would want to use it in XP, well here is great news for you. Two people have made a superb welcome screen for XP that looks so much alike the Vista welcome screen. Below I have given some screenshots, which were taken in xp. So for those of you who love the vista welcome screen and want to use it in xp, here you go have fun 
All you need to do is to download the link and unzip the file, and add the Welcome Center.exe to the Startup you can use a software like Autoruns. Or just simply create a shortcut of the Welcome Center.exe and paste it in Start ?> All Programs ?> Startup.
Download Vista Welcome Center for XP
All credit of this creation goes to ?Dantaylor17? and ?FediaFedia?.
Lol, there is a funny bug. You can grab “welcome center” word and change its position. Try it