Not being hit on any of my machine's, but then again none of mine are XP. What firewall are you using? And you said your runnig Win98 (which I have on one of my boxes) and your getting probed. If your saying your firewall is blocking access to the port and is stopping the attack, you have nothing to worry about. You will always be probed for various port's all the time, some more than other's though.