Process Explorer might tell you what other modules and DLLs are loaded with the application. That might provide some insights as to why it is hanging. http://technet.microsoft.com/en-us/sysinternals/bb896653.aspx
Under Windows 7, hung processes are very frustrating because you can "kill" them many times and yet they will not quit. I've had some luck with doing a complete uninstall (Revo Uninstaller is helpful), followed by a clean reinstall.