Sometimes you can't access a WinXP computer after installing Norton Anti-Virus. There might be a variety of errors at the other computer depending on the operating system. On the XP computer, in the Event Viewer / System log, there will be the following error: The server's configuration parameter "irpstacksize" is too small for the server to use a local device. Start Regedit Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\ Services\lanmanserver\parameters Edit the IRPStackSize Give it a value of 15 Reboot the computer
