H'okay, so... I have set up an 802.11n wireless network at my house. In total, I have about 6 computers (2 apple macbook/pro laptops and a dell laptop, 3 dell desktops), an appletv, and an xbox360 attached to it. I am using an Apple Airport Extreme as the router. I have Dlink DWA542 cards for all three of the desktops. The xbox360 uses an airport express to bridge to the wireless network. The three laptops all have built in cards. I don't have cable internet installed at my house yet, so I walked next door to my neighbors and asked if I could hook my airport extreme to their router. Mission successful. Now, my problem: I can connect with all of my computers, laptops, and devices with almost full signal except for ONE of the dell desktops. I installed the card and it worked for the first 5 minutes, then it says there are no wireless networks detected. Now, there are a few other wireless networks around the neighborhood that I am picking up, but none of them show up on that computer. Another desktop is right beside it (within 10 feet), and can connect perfectly to the router. - I tried reinstalling drivers and switching PCI slots, no luck. - I tried switching the card with another card from another desktop that works, no luck. - I tried each channel on the router, no luck. - I tried repositioning the computer, no luck. When reinstalled, it will sense all the wireless networks around and then 5 minutes later, claim there are no networks. So I know it isn't the card or the slot or the router, what could the problem be?