Microsoft.Mshtml throws exception in Windows 7 64 bit machine, where as it is working fin with 32bit machine.

I have a WPF application, in which we are using webbrowser to render web pages on it.

((mshtml.HTMLButtonElement)(element)).type throws below exception when we run on Win7 64 bit machine.

Member not found. (Exception from HRESULT: 0x80020003 (DISP_E_MEMBERNOTFOUND))(System.Runtime.InteropServices.COMException)
   at System.RuntimeType.ForwardCallToInvokeMember(String memberName, BindingFlags flags, Object target, Int32[] aWrapperTypes, MessageData& msgData)
   at mshtml.DispHTMLButtonElement.get_type()

Microsoft.mshtml reference properties:

Embed Interop Types: True

Runtime Version: v1.0.3705

Specific Version: True

Version: 7.0.3300.0

Microsoft.Mshtml throws exception in Windows 7 64 bit machine, where as it is working fine with x86 bit machine;Please help me in this regard.