You have to have Media Player installed as Windows Feature (classic won't do).
Let me know if that helped you guys.
Very sorry for necro-ing this thread, but just spent about an hour and a half to get this to work.
If any other PC-gaming microsoftophobe turned off windows media player during installation, apparently you can easily get it back in by going to the
Control Panel, then Programs, then Programs and Features and finally by clicking on "Turn Windows Features on or off".
There you go to Media Features where you can turn WMP on again.
Would have hated myself to have to ask, but couldn't resist posting the "solution" in the forum.
Also... Hi, I'm new!
Hopes: so skyhigh I bought without testing (too lazy to fix the above issue for the demo alone)
First New Game, here I come!