License keys in VB

Hi all,
I want to incorporate license keys screen in my application, which on start up will ask for license keys and will install the application only if it matches the keys provided to the authenticated user else it would abort the installation. How this can be accomplished in VB

How About Manipulating Project - Project1.Vbp That Comes With The PDW .

Care To Be Taken While Manipulating Else Might Cause Some :o