There are few desktop modifications around which can transform your Windows XP into Windows Vista interface. Not all of them are good but few of these tools really rocks.
Vista Transformation Pack – Bring to your desktop the look of Microsoft’s future operating system, Windows Vista
I’m pretty sure you must know and have seen Windows Vista before. It looks really nice for major GUI updates. Many people who have seen it wish to get Vista-style looks for their operating system. It might sounds stupid to say this since you all know what it is but just bear it. Vista Transformation Pack will transform your Windows user interface to ultimate Windows Vista alike looks that everyone will never notice it’s the same old Windows XP (or 2003).