Turn network Discovery on for WIndows 7 GPO

1. In the Group Policy editor on a Win7 or Windows Server 2008 R2 computer, open the GPO that you want to use in the Group Policy Editor.
2. Expand "Computer Configuration", "Windows Settings", "Security Settings", "Windows Firewall with Advanced Security", and then "Windows Firewall with Advanced Security - {policy you have open}".
3 Right-click "Inbound Rules", and then click "New Rule".
4 In the Rule Wizard, on the Rule Type page, select"Predefined", and then select Network Discovery from the list. Click Next.
5 On the Predefined Rules page, ensure that the check box is on each rule that is part of the Network Discovery group, and then click Next.
6 On the Action page, select "Allow the Connection", and then click Finish.