Windows 7 ICS not working

Troubleshooting Steps:​

• Reconfigure Network Settings:
• Go to "Network and Sharing Center" and ensure that the ad hoc network is set as a "Home" or "Work" network and not as a "Public" network. Public networks often have more restrictive settings.
• Check the sharing settings to confirm that the Internet connection is being shared correctly.
• Reset Network and Check Services:
• Reset the network adapter settings by disabling and re-enabling the network adapter.
• Check if the necessary networking services like "Network Location Awareness" and "Network List Service" are running. You can do this by typing services.msc in the "Run" dialog (Windows key + R).
• Update Network Adapter Drivers:
• Ensure that the network adapter drivers on both laptops are up to date. Outdated drivers can sometimes cause connectivity issues.
• Check Firewall Settings:
• Verify that the firewall settings are not blocking the ad hoc network connections. Temporarily disable the firewall to check if it is causing the issue.
• Check Network Security Protocols:
• Make sure that the security protocols (WEP, WPA, etc. on the ad hoc network are correctly configured and match between both laptops.
• Verify Option 3G Ultra Expresscard Connection:
• Ensure that the host laptop connected through the Option 3G Ultra Expresscard has a stable and active connection to the AT&T 3G network.
• Network Troubleshooter:
• Use the built-in Network Troubleshooter in Windows 7 to diagnose and fix common network-related problems.
• Check for Interference:
• Look for any possible interferences like other wireless devices or signal disruptions that might affect the ad hoc network connectivity.
  

  Additional Tips:​

• You can also try deleting and recreating the ad hoc network settings from scratch to see if that resolves the issue.
• Make sure the SSID and password for the ad hoc network are correctly entered on both laptops. These steps should help in resolving the issue without the need for a clean install of Windows 7. If the issue persists, you may consider further troubleshooting or seeking professional assistance.