VBA macros do not returning Unique hardware ids for few systems

I'm trying to create a unique id for the system using VBA macros, but it's returning blank values from a few computers. The unique id system takes into account the following parameters: 'GetMotherBoardProp,' 'ComputerName,' 'GetDDSerialNumber,' 'GetBIOSProperties,' 'CPUID,' and hashes it with md5

Public Function MD5Hex(textString As String) As String
On Error GoTo HashError
  Dim Enc
  Dim textBytes() As Byte
  Dim bytes
  Dim outstr As String
  Dim pos
  Set Enc = CreateObject("System.Security.Cryptography.MD5CryptoServiceProvider")
  textBytes = textString
  bytes = Enc.ComputeHash_2((textBytes))
  For pos = 1 To LenB(bytes)
    outstr = outstr & LCase(Right("0" & Hex(AscB(MidB(bytes, pos, 1))), 2))
  Next
  MD5Hex = outstr
  Set Enc = Nothing
  Exit Function
HashError:
  SendToLogFile "Error while executing 5th Module"
  SendToLogFile Err.Number & vbTab & Err.Description
  MsgBox "Error while displaying Info Keys", vbCritical, JT
  End Function

For getting bios properties used this code from Devhut

Edit:1 These hashes will be saved in my Google spreadsheet. and here are the responses for the few: Systems Responses Help me to solve this problem