Can't create active x component

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C#

Hi,
I got an exception while running windows application in vb on windows7 64-bit machine. Code is

Public Function Login(ByVal userName As String, ByVal password As String) As Boolean
            Try
                sessObject = CreateObject(QRules.SessionClass)
                sessConnbject = CreateObject(QRules.ConnectionInfo)

Note: QRules is a dll.
While executing this code it throws an exception 'Can't create active x component'. But this code successfully executed in windows7 32-bit machine.

Thanks in advance
Ani