Liberty Court Player can open only .dcr files. If your disc doesn't contain .dcr files, the program can't open it. If there are .dcr files, you can open them manually. Launch the program, press Ctrl + O key combination, navigate to the disc drive and open the files. If it doesn't work, right-click on Computer icon, select Manage and open Device Manager. Expand the Disc Drives list, right-click on the driver and select Uninstall. After that, reboot your PC, press Scan for hardware changes icon from Device Manager, wait for Windows to retrieve the drivers and try again.
