Shoutbox

I think he means he downloaded a theme from DA and wants to apply it.

First you need to patch your uxtheme.dll (google how to do this). Once this is patched, doubleclick the .msstyles file and click ok to apply it. You might also want to copy the folder with the msstyle file to %systemroot%\Resources\Themes so that if you ever open Display Properties again and want to change your theme, it will always display in the list of possible theme choices.