Probably you have seen, there are many third party themes available in different websites, forums.
You have downloaded them, but cant find the way, how to install these themes. Here is how:
1.You have to patch three system files in Windows 7.
These three files are uxtheme.dll, themeui.dll and themeservice.dll (in “%windir%\System32″).
Note: The program will make Windows into thinking all themes are signed thus allowing any installed custom theme to run. The patch modifies system files that could potentially end up being corrupted in the process, resulting in a repair install or a format.So, its advisable to make a back up beforehand).
The easiest way to do this is to download this Universal Theme Patcher and run the exe file.Universal Theme patcher supports Windows XP SP2\SP3, Server 2003, Vista SP1\SP2, Server 2008 and Windows 7 (It can be used in both 32-bit (x86) and 64-bit (x64) systems.
2.Open the downloaded zip file:
3.You can read the Readme text if you want then double click the right version of Universal Theme Patcher.
4.It will open a new Window Prompt:
5.Click OK to continue:
6.My System is 64 bit,you will get the same dialog box in 32 bit version.Click Yes to continue.
7.This will bring a new Window:
8. I have already patched my system,so the Patch tabs are inactive. You will see the reverse (Active Patch tabs,inactive Restore tabs) if you run for the first time.Patch files one by one.Be patient.After patching all three dll files close the window.
9.Now,50% work done.Restart your system.
10.Copy the .theme file and its entire theme folder to:
11.Apply the theme using Desktop Personalization window (Generally these shows as installed themes).
12.Here is an Example: