Heres a the VBScript code for that, I did the same thing at my office, and it worked fine.
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Dim objFSO
Dim strSource, strTarget, bOverwrite
'Set this to true, b/c any GRC.DAT that exists in this folder we want to overwrite
bOverwrite = True
'The GRC.DAT is located in the VPHOME or VPLOGON share on the server that is running System Center
strSource = "\\server\VPLOGON\GRC.DAT"
'Set the target to be the All Users folder in Documents and Settings. (the folders is still called Norton AntiVirus Corporate Edition\7.5 even in version 8.1)
strTarget = "C:\Documents and Settings\All Users\Application Data\Symantec\Norton AntiVirus Corporate Edition\7.5"
'Create the file system object, this is the scripting object used for file handling
Set objFSO = CreateObject("Scripting.FileSystemObject"
'Copy the file
objFso.CopyFile strSource, strTarget, bOverwrite
'Clean up
Set objFso = Nothing
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Set it as a startup, or logon script and you should get everyone managed by the end of the day. Just note that the AV service has to be restarted after you do this. Its best just to restart the machine, this will force the AV client to logon to the AV server.
Hope this helps. If you have any questions/problems feel free to ask.
elazar