I got an error "Could not contact Windows Updates server, Please verify your network connection" when logging into NAC

1. Click Start, and then click Run.
2. Type services.msc and then click OK.
3. In the list of services, double-click on Automatic Updates (for Windows XP) or Windows Update (for Windows 7/Vista) and then click Properties.
4. In the Startup type list, select Automatic and click Apply.
5. Verify that the Service status is started, if the Service Status is Stopped click on the Start Button.