The Neowin UXTheme Multi Patcher allows you to use any 3rd party msstyle theme on Windows XP/SP1/SP2 or Windows Server 2003 (with Themes enabled) by patching the uxtheme.dll (dynamic link library).

Download Here

Changes
- Fixed replacing system file problems for other possibly ways to install Windows XP (it should work fine as replacer now)
- Supported Windows XP (English) with Service Pack 2 (build 2180)
- Updated program icon
- Fixed Service Pack checking mistake for Windows XP Gold (Unable to run patch) and Windows Server 2003 Service Pack 1 (Can detect only final release)

More Info Here