we have recently bought a new computer which i set up last night and has replaced my old one as the main desktop (connected to the modem and router) and now i want to make it so that my old computer can get wireless internet from my router. From what i understand i need a wlan card, i have one in a really old computer but my question is can i just take that card out and put it in the other computer? or do i need some kind of software or drivers?
You can do that but you will need drivers/software. You can most likely find the drivers online by just searching on Google the model number and card name.
Do u understand the concept of wireless??