We have several laptops with Windows 7 Pro and only one of them is giving us this problem. If we leave the IP address and DNS set to DHCP assigned the laptop logs onto the server normally but we get no internet. If we put the server IP address in the1st DNS field we still get no internet but logon is ok. If we put server DNS 1st and router address for 2nd DNS we get internet and logon is fine but only for the 1st logon. If we restart the computer and try to logon a second time it takes 4-7 minutes.