Here's what I use to dump the grc.dat to the client, this is using kix 4.02 and nav 7.60. I determine the $NAVSVR variable in an earlier portion of my script depending on which segment the user is on.. L8tr...

code:
  
Select
  Case @PRODUCTTYPE = "Windows 2000 Professional" OR @PRODUCTTYPE = "Windows XP Professional"
    Copy "\\$NAVSVR\VPHOME\GRC.DAT" "%ALLUSERSPROFILE%\Application Data\Symantec\Norton AntiVirus Corporate Edition\7.5\GRC.DAT"
  Case @PRODUCTTYPE = "Windows NT Workstation"
    Copy "\\$NAVSVR\VPHOME\GRC.DAT" "C:\winnt\profiles\all users\application data\symantec\norton antivirus corporate edition\7.5\GRC.DAT"
  Case 1
    Copy "\\$NAVSVR\VPHOME\GRC.DAT" "C:\Program Files\Norton AntiVirus\grc.dat"
EndSelect