I see that you're still on SP2, is this correct? Can you wired connect your computer to the router and download SP3
then followed by Windows updates?
TCP/IP RESET AND WINSOCK RESET FOR XP:
Repair a Corrupt TCP/IP Stack:
Open up a Command prompt, click on Start=> type cmd
press enter on the run box.
In the command line type: netsh int ip reset resetlog.txt
. Press enter.
Type in netsh winsock reset catalog
and press enter
After resetting winsock, Restart your computer.
Test your internet connection after and let us know.