what do u mean '' when i double click on any style files it takes me to the windows colour and appearance screen''?
if it takes you to windows clasic theme that possible means that , if you use uxcore utility for enablng your system accept 3rd party themes, that means that uxcore does not work.
now i will explain to u why: usually because of a specific microsoft's updates.
what you have to do, and is important to do this so, is first go to Control Panel\Programs\Programs and Features
and uninstall uxcore [even if it does not working, you have first to uninstall it]
then restart your system [this is important].
then install the uxcore
then restart. thats it.
[also some times because of specific microsoft's updates, shell32.dll have to be replaced again.]
if for any reason none of this works to you, follow the Tews good suggestion and use Universal Theme Patcher
[out of topic]
thank you oli.