Complete sentences are always nice to read in these forums.
You probably need to completely uninstall any old video card drivers (both nVidia and ATI). Then reboot, and then install the latest nVidia drivers for the new GT240.
Dual-link HDCP Capable4
Designed to meet the output protection management (HDCP) and security specifications of the Blu-ray Disc format, allowing the playback of encrypted movie content on PCs when connected to HDCP-compliant displays.
Download drivers here:http://www.nvidia.com/Download/index.aspx?lang=en-us&ptid=1&psid=52&pid=0