I ordered a wireless router, but got no wireless adapter or wireless card?

How do i find out if my pc already has one installed? It dosent show one up on my computer?
Update: Im using a desktop and it says on network connections 'local area connection connected, firewalled'

There is nothing else in the category. I assume I will need to get a wireless adapter to go with the router, will it need to be netgear like the router or will any one do?
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