I can play the game on the pc
I can open the game through the voobly directory

I cannot Launch a game through the Voobly game room
It says error detected and when I run diagnostics it says "everything looks fine"

Any ideas to solve this (Note: I use Windows 7 Professional)

I see you're enjoying your games now, so I guess the problem has been resolved?

Otherwise reinstalling is always a good thing to try, and making sure you allow Voobly to do all it needs to to the game when joining the lobby for the first time - it installs all the required patches and such.