Vista - Security EventLog

Hello,


Can anybody help me with this script.
I want 20 DC to have a every 3 hours a backup of the security eventlog, but
on a DomainController it doesn`t work,
only the Application and System eventlog will work.

The script give me No errors. I`m member of the administrators and domain
admins group.





Here is the script.
strComputer = "."
Set objWMIService = GetObject("winmgmts:" _
& "{impersonationLevel=impersonate,(Backup)}!\\" & strComputer &
"\root\cimv2")

Set colLogFiles = objWMIService.ExecQuery _
("Select * from Win32_NTEventLogFile where LogFileName='Security'")

For Each objLogfile in colLogFiles
errBackupLog = objLogFile.BackupEventLog("c:\temp\Security.evt")
If errBackupLog <> 0 Then
Wscript.Echo "The Application event log could not be backed up."
End If
Next



Floyd