I have a Dell M90 laptop with a NetXtreme 57xx gigabit network controller. The card seems to be operating properly. It gets a dhcp address without a problem and connects to the network. The problem is when I go into control panel under network connections, right click on the NIC and try to go to properties. When I do this, I get the message "an unexpected error has occured". I also get this same message for the wireless card. The device manager shows both cards operating properly. I have uninstalled the drivers and reinstalled with new drivers from Dell's website. The problem also exists in safe mode. The hardware will pass the diagnostic program from Dell. I have tried to log on as a new user so a new profile is created and still have the same problem. I am out of ideas. Thank you.