Most of us wants to change the oulook of our Windows in many methods.And the 1st thing we need to do is changing our default theme to custom gorgeous 3rd party theme.But Windows don't allow 3rd party themes to be used by default and you'll need to patch following 3 system files to be able to use 3rd party themes in Windows:
All these 3 files are stored in "%windir%\System32" folder. Manually patching these files is a risky and time consuming task, so where you fine a small utility which can help you in patching these files easily and quickly.
"Universal Theme Patcher" is an excellent UxTheme Patcher which supports-
Windows XP SP2/SP3
It can be used in both 32-bit (x86) and 64-bit (x64) systems.
You Just need to click it then restart your PC.Nothing else!!!!
Here's total tutorial with screenshot.Just take a look please.
Check this link to Download some magnificant Themes.
Windows XP Windows Vista Windows 7