This will be a guide how to install Windows 7 themes properly. You can install themepacks created on Windows 7 by double-clicking on it, but for 3rd party themes you will have to patch your uxtheme.dll,themeui.dll and themeservice.dll.(You will find this files in C:/Windows/system32)
First you need to backup this files for security.
I attach the Universal Theme Patcher,and is free to download.Work in 32-bit and 64-bit.
I have 64-bit and works for me every 3rd party theme! Attachment 82311
< There are the attachment! 100% free!!!!!
If you have any questions I respond.