I would suggest you to Turn on network discovery on Windows 7
1.Open Advanced sharing settings by clicking the
Start button, and then clicking
Control Panel. In the search box, type
Network and Sharing Center, and then, in the left pane, click
Change advanced sharing settings.
2.Click the chevron to expand the current network profile.
3.If network discovery is off, under
Network discovery, click Turn on network discovery, and then click
Save changes. If you're prompted for an administrator password or confirmation, type the password or provide confirmation.