I'm not sure if this is an OS problem or not - but 7 just suddenly stopped recognizing my external NIC card on my laptop. I was on a bus, and was perfectly able to use it to connect to a friend's laptop. I got off of the bus and walked 20 feet to my house. When I opened it up again, it would not recognize the card. I've rebooted it 4-5 times, opened it up and blown it out with compressed air, etc. I can't tell what's wrong. The transmit/power lights are both lit up on the card - but 7 doesn't recognize that it's connected - making me think it's an OS problem. Help?