Question

Whenever the user start using my application it should check the current default homepage of the default browser if( homepage != xyz.com ) i want to change homepage to xyz.com

Answer 1

The browser home page for Internet Explorer is controlled by the registry key

HKCU\Software\Microsoft\Internet Explorer\Main

To set this from VB use the following

Imports Microoft.Win32
...

Module Util
    Sub SetHomePage(Dim theUrl As String)
        Registry.SetValue("HKCU\Software\Microsoft\Internet Explorer\Main", "Start Page", theUrl)
    End Sub
End Module