strComputer = "." 

Set objWMI = GetObject("winmgmts:" _
& "{impersonationLevel=impersonate}!\\" _ 
& strComputer & "\root\cimv2") 
Set colComputer = objWMI.ExecQuery _
("Select * from Win32_ComputerSystem") 

For Each objComputer in colComputer 
total_mem = objComputer.TotalPhysicalMemory / 1024 / 1024
Wscript.Echo total_mem