vb6 app needs vista compatibility

i have a vb6 app that needs to have vista compatibility. It installs / works fine in 98/me/2000/xp. It's not a large program. I get problems with dll and ocx registration on vista install. I would like the install to go smoothly without user having to "run as administrator" and I am not sure if there is compatibility issues with the app's dlls and vista's.? I don't have time or patience to figure it out.