I had an older laptop and restored it to the factory issued XP. This resulted in exactly what you noted. To fix that machine I had to let it update (took a day) and then install the driver issued by the maker to add WPA2 support. All good now.
I restored my Sony Vaio laptop VGN-NR220E to factory settings and now it won't connect to internet. (It would connect before I restored)
I have a wireless Netgear router...and it will connect to router but no internet. It says unidentified network.
So, I turned off the secured network and now it will connect to internet. But obviously don't want to keep my wireless open and not secured.