Manually modifying Setup.vbp in Visual Basic

Hi everyone,

This is a problem i am facing while making installations at client's places. The dll's and other controls which are already present in the user's machine might be of an higher version. So, how can i ensure through my setup to check for the same and ignore installing it. Otherwise, an error message is popped up and when the user aborts the same, installtion stops. If someone can mail me the source code regarding how exactly it is done, i will be very greatful. Thanx in advance.