How To Enable/Disable Network Discovery In Windows 7
Network Discovery is a network setting that allows you to configure your Windows PC in such a way that your computer can find other computers on the network and whether other computers on the network can find your computer. When Network Discovery is turned ON, your PC is visible to other Users in Network. When turned OFF, others can’t find your computer in Network.
Turn ON Network Discovery
1. Click Start –> Control Panel
2. Change the view to “Large Icons”, scroll down the list and click on “Network and Sharing Center” link.

3. In the left side pane of “Network and Sharing Center” window, click on link “Change advanced sharing settings”.

4. Select “Turn on network discovery” radio button.

5. Click “Save changes” button.
You are done. Your Windows PC will now become visible to other Users in the network.
Turn OFF Network Discovery
Follow Step 1,2, and 3 same as described above. In Step 4, select “Turn off network discovery” and click “Save changes” button.