UXTheme Multi-Patcher 6.0
UXTheme Multi-Patcher patches the UXTheme.dll for Windows XP and 2003 (x86/x64) and allows you to use un-signed custom visual styles.
To simply patch the UXTheme.dll file, run the program, it will determine your operating system, then patch the appropriate file and reboot your PC.
To un-patch the UXTheme.dll file, run the program again, and it will un-patch the .dll and then reboot your PC.
Download: UXTheme Multi-Patcher 6.0