Try this if you are still having problems - you can alter the location of the logfile in the script but it should at least generate a file with some info in it.

code:
Break on
? "What PC would you like to query for disk info? (Press return for local machine) "
Gets $target
If not $target
	$target = @WKSTA
Endif
$WMI = GetObject("winmgmts:{impersonationlevel=impersonate}!//" + $target)
If $WMI
	$Disks = $WMI.ExecQuery("select * from win32_logicaldisk")
	;$x = Open(1,"\\server\share\disklog.txt",5)
	$x = Open(1,"c:\disklog.txt",5)
	If @ERROR <> 0
		? "Error opening logfile!"
		Goto end
	Endif
	for each $disk in $disks
		$name = $disk.name
		$size = $disk.size
		$filesystem = $disk.filesystem
		$freespace = $disk.freespace
		$x = Writeline(1,$name + " " + $filesystem + " " + $size + " " + $freespace + chr(13) + chr(10))
	next
	$x = Close(1)
Else
	? "WMI not connected - error!"
Endif

:end
Exit
Hope this helps.
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Breaker