The issue you are experiencing with network visibility between your Windows 7 PC and other PCs, despite Norton Internet Security and ping being able to see all the network devices, could be due to several reasons. Here are some common troubleshooting steps you can take to address this problem: 1. Check Network Discovery Settings: - Ensure that network discovery is turned on for all PCs. To do this: - Go to Control Panel > Network and Sharing Center > Change advanced sharing settings. - Make sure that Network discovery is enabled. 2. Workgroup Settings: - Verify that all PCs are in the same workgroup. - Right-click on Computer > Properties > Advanced system settings > Computer Name > Change. - Check the...