Windows Installer is asking for "project.msp" after uninstalling Project 2003

I recently uninstalled Project 2003 from a PC running Windows XP SP2.  The uninstallation completed successfully and everything appeared to be fine until the user went to open a file in Visual Basic 6.  At that point Windows Installer displayed the following message: "The feature you are trying to use is on a network resource that is unavailable.  Click OK to try again, or enter the alternate path to a folder containing the installation package 'PROJECT.MSI' in the box below".  I pointed the installer to the project.msi file that we have stored on a network share.  At that point the installer asked for projectsp3.msp which I was also able to provide by extracting it from the Microsoft Project 2003 Service Pack 3 redistributable.  Now Windows Installer is asking for project.msp and I have not been successful in finding it.  More importantly, why is this happening and how can I resolve the underlying problem?  I have reinstalled VB6 with no success and attempting to reinstall Project produces the same request for project.msp.