1) Did you download and try the demo first? It needs to be completely uninstalled before installing the 707-300.
2) Is SP2/Acceleration installed? This is a part of the minimum specifications needed to use the 707-300.
3 ) Try reinstalling it (use the repair option). Make sure, if using Vista or Windows 7, to install it as the administrator.

If you still have the problem after trying those, I'll give you some other ideas that might get it working.

Mark