The program needs to have a printer installed, before it is able to show reports.
Even if you do not have a printer, you can install one in Windows - Install it as a "generic type printer". Then you will be able to see previews of reports on screen.
On networks, printing will also work. Certain problems with drivers or problems with Windows, might mean that you need to install the latest printer driver in Windows, and sometimes also install an extra printer - even if one isn't available.