Or.. if a search does not turn one up, here is one you can work on and modify or gleen more information from.

code:
IF @INWIN = 1
$SRVR = ReadValue("HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\ProductOptions", "ProductType")
IF $SRVR<>"WinNT" ; System is not a Workstation so assume it is a Server
RETURN
ENDIF
ENDIF
IF $NoNavWarn <> 0
$nul = MESSAGEBOX("Unable to locate the Norton AntiVirus program on this system. Please contact the Helpdesk to have the program installed or checked for problems with a previous installation. ", "Norton AntiVirus Program Update", 16)
RETURN
ENDIF

IF EXIST($NavHome+"\GRC.DAT")
SHELL $CleanGRCx
DEL ($NavHome+"\GRC.DAT")
ENDIF
IF EXIST("$DataLocation\Symantec\Norton AntiVirus Corporate Edition\7.5\GRC.DAT")
SHELL $CleanGRCy
DEL ("$DataLocation\Symantec\Norton AntiVirus Corporate Edition\7.5\GRC.DAT")
ENDIF

SELECT
CASE (SUBSTR(@IPADDRESS1,1,7)) = "129.105" AND $PARENT = "server1"
RETURN
CASE (SUBSTR(@IPADDRESS0,1,7)) = "122.123" AND $PARENT = "server2"
RETURN
CASE (SUBSTR(@IPADDRESS0,1,7)) = "122.116" AND $PARENT = "server3"
RETURN
ENDSELECT

SELECT
CASE (SUBSTR(@IPADDRESS0,1,11)) = "129.105.122"
$NavParent = "server1"
CASE (SUBSTR(@IPADDRESS0,1,11)) = "122.123.121"
$NavParent = "server2"
CASE (SUBSTR(@IPADDRESS0,1,11)) = "122.116.122"
$NavParent = "server3"
CASE 1
$NavParent = "server1"
ENDSELECT
$GrcUpdateNew = '%comspec% /c copy "\\$NavParent\vphome\grc.dat" "$DataLocation\Symantec\Norton AntiVirus Corporate Edition\7.5\GRC.DAT" >nul'
$GrcUpdateOld = '%comspec% /c copy "\\$NavParent\vphome\grc.dat" "$NavHome" >nul'

IF @INWIN = 1
IF (Exist($DataLocation+"\Symantec\Norton AntiVirus Corporate Edition\7.5\nul") = 1)
$x = MESSAGEBOX("Please wait... Norton AntiVirus Definitions are being updated on your system...", "Norton AntiVirus Program Update", 64, 10)
SHELL $GrcUpdateNew
SHELL '%comspec% /c NET STOP "Norton AntiVirus Client" >NUL'
SHELL '%comspec% /c NET START "Norton AntiVirus Client" >NUL'
RETURN
ELSE
$x = MESSAGEBOX("Please wait... Norton AntiVirus Definitions are being updated on your system...", "Norton AntiVirus Program Update", 64, 10)
SHELL $GrcUpdateOld
SHELL '%comspec% /c NET STOP "Norton AntiVirus Client" >NUL'
SHELL '%comspec% /c NET START "Norton AntiVirus Client" >NUL'
RETURN
ENDIF
ENDIF

IF @INWIN = 2
SHELL $GrcUpdateOld
$x = MESSAGEBOX("Notice: Norton AntiVirus Definitions were updated on your system. Please restart your computer to complete the Norton AntiVirus update once the logon script and any other applications have finished loading.", "Norton AntiVirus Program Update", 64)
RETURN
ENDIF
RETURN