Hello and welcome to TSF
it seems that the game has issues in Windows 7 because the game installs starforce (starforce is an antipiracy software that is used in several games)
so try this:
download revo uninstaller from my sig and use it to uninstall the game and remove all its remains from the HDD and from the registry when prompted
reboot.
install the game and run it, it will ask you to install starforce driver and then reboot, when you reboot download and install the Starforce driver that is compatible with Windows 7:
http://www.star-force.com/support/sfdrvup.zip
reboot your PC and try the game