Slow shutdown caused by 802.1x authentication

My computer has the problem as indicated by this website (http://www.aumha.org/win5/a/shtdwnxp.php):
USING SHUTDOWN SCRIPTS & 802.1x AUTHENTICATION PROTOCOL. This combination can cause Win XP to take in excess of 10 minutes to shutdown normally. (IEEE 802.1x is an authentication standard for both wireless networks and wired Ethernet networks.) Here’s how the dominoes fall: The 802.1x authentication protocol stops after the user logs off. Shutdown scripts run after the user logs off. If the script is on a network share and the connection is no longer available (since authentication has terminated), the script can’t run. The default time-out for shutdown scripts is 10 minutes. So the computer sits there 10 minutes before continuing with its shutdown. (Reference: MSKB 311787.)


Microsoft support has something on it too: http://support.microsoft.com/?kbid=311787


Some background information: I'm using a Dell Latitude D630. My hard drive broke a few days ago so I bought a new one. I installed the hard drive, Windows, and the drivers on my own, and my computer is now working real spiffy except for the fact that it takes 10 minutes to shut down or restart. If it matters, my computer is connected to a wireless signal from the router on my dad's computer.

so anyone have any idea how to fix this? I couldn't find any solutions from searching google.