Unable to access Wireless Network Connection Properties Window

Dear Sirs:

My laptop does not allow me to access the Windows Network Connection Properties Window, I have no problem looking at the contenets on th General and Advanced tabs but when I try click on the tab of thw Wireless Network COnnections, it returns an error message window which indicates the involvement of explorer.exe and netshell.dll. Sometimes I also get an error emssage that involves BCMWLTRY.exe and ntdll.dll. Most times it's explorer.exe.

I can stil access the wireless connection. I just can't change any settings.....What should I do ?

By the way, It is only the wireless network tab undet the wireless network connection properties window that doesn;t seem to work. It seems the culprit is netshell.dll because in both explorer.exe and BCMWLTRY.exe (from the wireless vendor) that netshell.dll is involved.

How can I reinstall this dll from my Windows XP disk ?

Antonio