Dark windows theme messed up, aero is messing up

Hey i have this strange problem, so i just downloaded this windows 7 dark theme from windows7themes.com,
i downloaded a few of them, but the black ones doesn't seem to work properly, here is the screenshot

The black part that's supposed so be black is white, i have no idea what happened, but here's the thing:
I downloaded a theme few weeks ago, i didn't know it requires xp to be ran, so i just downloaded it, it has an
setup.exe, i ran it, and suddenly my windows has lost all of it's aero features, i turned back the theme to the original, it took longer than usual, and it's fixed, but i fear it's what's causing this.

I don't know if that's what causing this, but it would be appreciated if anyone can help.
Thanks