Open the Windows Update troubleshooter
If your computer is having problems finding and installing operating system updates, try using a Windows Update troubleshooter to fix the problem. It makes sure that your computer is connected to the Internet, and checks to see whether your network adapter and Windows Update services are running correctly.
Open the Windows Update troubleshooter by clicking the Start button , and then clicking Control Panel. In the search box, type troubleshooter, and then click Troubleshooting. Under System and Security, click Fix problems with Windows Update.