[Dupe]DWM is not running"Please switch to an aero..."

I just bought Cubase Pro 8 and upgraded from C7,5 and trying to started the program, this message came up?
DWM composition is not running “Please switch to an aero Theme”
I cannot find anything in my computer that say I have “Aero theme” (what on earth is that?)
Now the program doesnt start at all though I have reinstalled it once already.
C7.5 is still ok

Win 7 PRO
i7 CPU 950 @ 3,07GHz
12 GB ram
64 bit