5 Windows 7 (Seven) Transformation Packs
Since the first fake Windows Seven screenshots got on the Internet, people have been eagerly waiting for transformation packs to transform their current Windows XP or Vista to look like Windows 7, as shown in those screenshots.
Here’s a list of five Windows Seven transformation packs that you can use. 4 packs are for Windows XP users, and 1 is for Vista.
NSFormation Pack 1.0
Vienna Transformation Pack v1
HFN Windows Transformation Pack
Windows 7 Transformation Pack for Vista
Alternatively, you can also try the Windows 7 theme for XP and Vista.