can't read a cer file

My code

    Dim CkCert As New ChilkatCert
    Dim Info As TInfoCer
    Dim success As Boolean

success = CkCert.LoadFromFile(sArchivoCer)
    If (success <> True) Then
        MsgBox (CkCert.LastErrorText)
        Exit Function
    End If

Return:

ChilkarLog:
 LinkPrivateKey:
  DllDate: Dec 29 2015
  ChilkatVersion: 9.5.0.55
  UnlockPrefix: NONE
  Username: CAJA3:SISTEMAS
  Architecture: Little Endian; 32-bit
  Languaje: ActiveX
  VerboseLogging: 0
  KeyContainer: C:\Datos\Archivo.cer
  machineKeyset:1
  forSigning: 1
  No certificate
 -- LinkPrivateKey
 -- ChilKatLog

this error is sent only on a PC with Windows Vista 32. It works with the same file on other PCs.