So download and install the brico pack on your system and Enjoy the themes as similar to Vista, Mac an Win 7 without changing your Operating System for better appearance.
BricoPack Vista Inspirat is a free pack which modifies Windows XP system files in order to change its appearance and make it look like Windows Vista (the next operating system made by Microsoft). So below I have posted the Screenshots to see how your Pc will look after applying the themes. Click On Download links to download the themes.

Download longhorn Inspirat


Download longhorn Inspirat