I cannot create a new SHDocVw.InternetExplorer

Consider the following peice of code :

If (ias.WebBrowser Is Nothing) Then
    ias.WebBrowser = New SHDocVw.InternetExplorer
End If
waitTing(1)

It produces the following error :

"Retrieving the COM class factory for component with CLSID {0002DF01-0000-0000-C000-000000000046} failed due to the following error: 80080005 Server execution failed (Exception from HRESULT: 0x80080005 (CO_E_SERVER_EXEC_FAILURE))." String

Where is the problem?

Interesting: I can't open internet explorer at all. How do I reinstall it?