If you have any spare PCI expansion ports in your desktop (if your computer is one) you should be able to get a card to fit that.
I may be out of date but I think the fastest wifi is 802.11g+, which is 108 Mbps max transfer rate. Obviously you need both devices, the router and the card/usb stick you buy to support the same protocol. Regarding the router, best to get one that is backwards compatible with the a and b (not to mention standard g speed) as well so if any friends come over and want to connect they have a fair chance to.
Security wise I'd recommend getting a router that does MAC filtering (so it only lets network devices connect that it has the MAc addresses registered in - fairly easy to setup though I often forget this when I get new devices lol) and WEP encryption (WAP is not as secure).
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I may be out of date but I think the fastest wifi is 802.11g+, which is 108 Mbps max transfer rate. Obviously you need both devices, the router and the card/usb stick you buy to support the same protocol. Regarding the router, best to get one that is backwards compatible with the a and b (not to mention standard g speed) as well so if any friends come over and want to connect they have a fair chance to.
Security wise I'd recommend getting a router that does MAC filtering (so it only lets network devices connect that it has the MAc addresses registered in - fairly easy to setup though I often forget this when I get new devices lol) and WEP encryption (WAP is not as secure).