InstallAware

Hi, I am having a problem where the uninstallation process removes all files that are visible to me in the install directory, but is leaving behind sort of a ghost copy of one of my files, so when i reinstall, the program finds it somehow, but it is not visible to me. This is due to UAC I believe, where the uninstaller is not uninstalling all files for all users. Has anyone heard of this before and know how to fix it?

A start could be an instruction to the uninstaller to remove for all users?

or how do i ensure that the program installs for all users and removes for all users?