Wired Windows Installer problem

I took over a VB.Net project. The previous person developed two installer for the VB.Net application. one I called "Local installer", which is supposed to install on PC, and another installer is called "portable installer" which is for installing the application on
laptop. Both installer are under the same VB.NET solution and as seperate projects.

I had no problem install "local installer". When I was trying to install "portable installer", the computer asked me to install MDAC Version 2.6 or higher. I downloaded MDAC 2.8 and installed. But I still get the same error message. I tried rebuiding project, but it
did not work as well. I am very confused because one installer works fine while the other does not work.

Any input?