Tips for Limited Network Connection on Vista

Try out steps as below, it is a quick fix for me:

Quick Fix:
TCP/IP stack repair options for use with Windows Vista.

1. Start, Programs\Accessories and right click on Command Prompt,
select "Run as Administrator" to open a command prompt.

2. Reset WINSOCK entries to installation defaults: netsh winsock reset catalog

3. Reset IPv4 TCP/IP stack to installation defaults: netsh int ipv4 reset reset.log

4. Reset IPv6 TCP/IP stack to installation defaults: netsh int ipv6 reset reset.log

5. Reboot the machine.