Class does not support Automation or does not support expected interface with VB 6.0

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VB6

Hi,

I have developed one IE automation project and deployed in some different clients, everywhere its working fine but my one client end I am facing one issue. which creating an instance with Create Object is giving me error no 430, "Class does not support Automation or does not support expected interface".
<pre lang="vb">Dim WithEvents IE As InternetExplorer

Private Sub Form_Load()

Set IE = CreateObject("Internetexplorer.application") '' Here I am getting an error.
IE.Visible = True
IE.Navigate ("www.google.com")

End Sub

Private Sub IE_DocumentComplete(ByVal pDisp As Object, URL As Variant)
MsgBox "Page Loaded"
End Sub

</pre>

1. I tried all mentioned steps in http://www.colba.net/~hlebo49/er430.htm, but none of them worked for me.
2. I also tried to migrate IE 6 to IE 8, but still its not working.
3. I have checked that given reference are proper.
4. I reregister below dlls but it couldn't resolve my issue.
<pre>regsvr32 Shdocvw.dll
regsvr32 Shell32.dll
regsvr32 Oleaut32.dll
regsvr32 Actxprxy.dll
regsvr32 Mshtml.dll
regsvr32 Urlmon.dll
regsvr32 msscript.ocx
regsvr32 dispex.dll
regsvr32 vbscript.dll</pre>

Can anybody help me out that I am missing what?
Here one surprise I found that I have been installed one software, which resolved this issue but while uninstalling that it appears again.

I am using Windows XP Prof. Ser. Pack 3 with IE 6.

Please help me out and thanks in advance...!