Start with this
Automated WINSOCK Fix for XP, reboot and test. If that doesn't do it, try these two commands.
TCP/IP stack repair options for use with Windows XP with SP2.
For these commands,
Start, Run, CMD to open a command prompt.
Reset WINSOCK entries to installation defaults:
netsh winsock reset catalog
Reset TCP/IP stack to installation defaults.
netsh int ip reset reset.log
Reboot and test. If it's still not working, do this:
Start, Run, CMD to open a DOS window:
Type the following command:
IPCONFIG /ALL
Right click in the command window and choose
Select All, then hit
Enter.
Paste the results in a message here.