Unidentified Network: Limited Connectivity

I recently installed Windows Vista on one of my desktops. Installation went fine, all programs loaded properly, network adapter recognized properly and everything was working fine. Recently I tried installing “Nortel VPN client” which is actually for Windows XP only so far and am using it on my other XP computers successfully. Thought it is only for XP, I tried to install and make it work on Vista but it dint worked. So I thought to uninstall it but here the problem started. It was creating errors while uninstalling.

So I thought to restore my system to earlier point assuming it will remove Nortel VPN client and will make my system as it was before installing Nortel. I restored the system successfully, Nortel was removed but the network icon in the system tray was showing "Unidentified Network" with "Limited Connectivity". Remember it was working fine before. I don’t have any idea what could be the cause of problem.

Can someone please help me out fixing the same? Thank you.

Here are few troubleshootings steps which can fix your Limited conenctivity problems:

• If your computer is currently connected to the Internet and the LAN without any connection problem, you may want to disable the message "Limited or No Connectivity".
• If you are using DHCP, verify DHCP server is available on your network and other computers can access it.
• Download and install the Update for Windows XP Service Pack 2 (KB884020)
• Check hardware connection and configuration.
• If you are using wireless, check this page, Sent packets only on a wireless computer and Limited or no connection
• Check firewall, spyware and winsock settings.