The core issue that is keeping the majority of Windows users away from changing their theme is the complexity of the procedure. While it takes just a click to install basic new themes under Windows 7 that change the wallpaper, color scheme and maybe some sounds, it is not as easy to switch to a full theme.
Why? Because Microsoft has built-in protections into the operating system to prevent tampering with core operating system interfaces. Before it is even possible to start changing themes under Windows it is necessary to patch those system files.
This meant running one or multiple programs back in the days. To make matters worse, some programs were not compatible with 32-bit versions and some offered different program versions for that. Lots of confusion in this regard.
The Windows 8 Skin Pack 1.0 For 7 is different. It comes with an installer that takes care of everything, if you want. It patches the uxtheme.dll automatically before installing all necessary theme files to turn Windows 7 into Windows 8.
Take a look at a screenshot of a Windows 7 Professional system after installing the Windows 8 theme on the system.