its either wireless drive issue or ethernet. f8 repeatedly tappign it on dell screen thenchoose safemode with networking (or without if unsucessfull) with arrows on keyboard then click yes..  now in desktop click start  then controlpanel. then system icon. then hardware tab. then device manager. open green network adapters + and remove both.. start. shutdown restart. and it autodetects them on startup and reinstalls them automatic.  that shoudl take care of issue. unless a firewall was installed after the prior restore point.