If so I see that a lot.
Have Windows forget that network and try again. If it fails again then manually configure the connection. I can't write a tutorial here but the control panel you want to see if this -> http://forevergeeks.com/how-to-setup-a-wireless-profile-on-windows-7/
I am currently staying in a holiday apartment which has wifi (can't see the router). I have 4 devices (ipad, W7 netbook, W7 laptop and Vista laptop) three of which instantly connect to the network and internet as soon as I input the password.
The Vista laptop (acer) instantly connects to the network but not the internet. When I go Network Sharing Centre is shows me it is connected to an 'Unidentified Network' even though underneath in 'Connection' it shows me the name of the network. I have gone through every setting and compared with the W7 laptop and everything seems identical. When I click repair it goes about Network adaptors? Very frustrating - anyone help please?