The notebook had Vista Home Basic Edition with SP1 installed. Googling, I realized that this was not an isolated issue but a prevalent problem among Vista users. This is a consolidated list of numerous recommended things I tried, before resolving the issue -
- Using Windows Diagnostics Mode to resolve the problem automatically. I received the message that the notebook was unable to acquire a new IP address and was asked to reset the router.
- Reset the router and modem individially and reset them together.
- Disabled DHCP and assigned a static IP to the notebook
- Connected the computer using a wired connection to the modem
- Uninstalled and reinstalled the wireless adapters numerous times
- Checked to see if the wireless adapters (NIC) had any more updates
- Was unable to connect in the safe mode with networking turned on
- Turned the IPV6 off to see if that was the issue
- Removed Symantec and AVG Anti Virus Software running in the system
- Turned Windows Firewall off to make sure that was not holding back the connection.
- Turned DHCP broadcast flag to ON in the Registry. Read more in this Microsoft KB Article
- Gateway 0.0.0.0 problem. Type 'route print' in the Command Window (Start->Run->Cmd->Enter). If you see a 0.0.0.0 entry against the Default Gateway, enter 'route delete 0.0.0.0' and then press Enter.
Its true that sometimes, the solution can lie just under your nose and you may overlook it :)
Bottomline - The guess is that, Windows has some software updates that might cause this problem to arise. So, once you have the system restored - you should be able to reinstall the Microsoft updates one by one to get hold of the culprit. I will update this blog with the details once I can pinpoint the software update!