I got the optiplex 790 from a friend, everything is working except for the internet, tried uninstalling the driver then restart the sysyem it doesn't work, tried installing the driver from dell and intel site still not working there is an error saying windows encountered an error, tried updated the bios to the lastest still not working, tried disabling and enabling it still doesn't work, and also fresh install the windows and still not working. Please help !!!!