If your computer is connected to a network, network policy settings might prevent you from completing these steps.
By default, Windows Firewall blocks network discovery (formerly called UPnP technology), but you can enable it.
Open Network and Sharing Center by clicking the Start button , clicking Control Panel, clicking Network and Internet, and then clicking Network and Sharing Center.
Click Turn on network discovery, and then click Apply.
If you are prompted for an administrator password or confirmation, type the password or provide confirmation.