It depends on what you mean by network card. If you are referring to the number of physical cards installed in the computer you would have to look in device manager for the device. This will only show devices that the system has detected to be network cards. If you are referring to the number of physical ports or connections to the system you have then the command line application IPCONFIG will give you a listing of currently configured devices and their addresses. Be aware that tunnelling devices are actually a way of giving a port a second name and are not physical devices.
