Dim diskClass As New System.Management.ManagementClass("Win32_LogicalDisk")
        Dim disks As System.Management.ManagementObjectCollection = diskClass.GetInstances()
        Dim disk As System.Management.ManagementObject
        Dim space As System.UInt64 = 0
        For Each disk In disks
            If disk("Description").ToString = "Local Fixed Disk" Then
                If disk("Description").ToString = "Local Fixed Disk" Then
                space += CType(disk("FreeSpace"), System.UInt64)
            End If
        Next disk