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Try to repair winsock and TCP/IP stack.
If you have XP-SP3 or Vista, you should use the built-in repair for the WINSOCK and TCP/IP stack. If you have XP-SP1 or earlier (and any previous version of Windows), you should use the
Automated WINSOCK Fix all Windows Versions. I've included all the resets here.
TCP/IP stack repair options for use with Windows XP with SP3.
Start,
Run,
CMD to open a command prompt:
Reset TCP/IP stack to installation defaults.
netsh int ip reset reset.log
Reset WINSOCK entries to installation defaults:
netsh winsock reset catalog
Reboot the machine.
TCP/IP stack repair options for use with Windows Vista.
Start, Programs\Accessories and right click on Command Prompt, select "Run as Administrator" to open a command prompt.
Reset WINSOCK entries to installation defaults:
netsh winsock reset catalog
Reset IPv4 TCP/IP stack to installation defaults.
netsh int ipv4 reset reset.log
Reset IPv6 TCP/IP stack to installation defaults.
netsh int ipv6 reset reset.log
Reboot the machine.