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Laptop 'suddenly' lost network, IPconfig...
Having lost his internet, a neighbor brought his laptop (Vista SP2, Atheros Wireless) to me last night. His Connection tooltip weirdly stated: Unidentified (Smith wireless).
Network Center showed Unidentified network.
There are 2 other laptops (XP and Win7 HP32bit) in his household that have no problems and can connect to the internet just fine. I first checked for viruses, of which I found several, including a rootkit. I cleaned the system up with malwarebytes, but still not connection, so I decided to restore an Acronis system drive image I made for him about a month ago. The results: Same network issues.
His TCP IPV6 & IPV4 properties were what one would expect...Obtain Auto on both counts, however, his IPconfig info for IPV4 were a bit odd. As can be noted from the screenshot, the Autoconfig IPV4 address and subnet mask weren't what I expected to see, nor were the DNS servers. And the Primary DNS suffix was blank.
I was able to correct the problem and get him back on line by manually entering the IPV4 address, Default Gateway, and DNS servers.
But I really wonder what caused this. Again, his was the only machine (out of 3 laptops) that was affected. Why would his auto settings suddenly turn on him?
Thanks for any insights.