Why don't you just search the internet for your laptop brand/model and see if a wireless network card was even an option.
Also, if you do not see some kind of indication on the keyboard, either by a key to turn the card on/off or some sort of wireless symbol or status light as an indication on if the card is on/off.
Some thing similar to this
.
You could even look in the Control Panel and there would probably be something in there to change settings if a wifi card existed.