Hi Jan,
I tried Win7 Home premium 32bit and also 64bit and I was able to install and launch GWD.
So I just want to make sure you saw
a) GWD was not installed at all. or
b) GWD seems to be installed but doesn't launch. or
c) GWD was installed and it launches but nothing in the application window. (Black or White).
Thanks,
Ume (GWD team)