If you like windows 8 new metro UI, but you still using Windows 7 then try this windows 8 metro skin pack.
Windows 8 skin pack for windows 7
Windows 7 SP1
Before install unistall old or other version of skin packs and disable user account controller and close all runnig program , after finish restart your system .
Download Windows 8 skin pack for windows 7 [X86 (32Bit)]