The uninstallation program leaves some files that can prevent you from reinstalling into the original directory. Delete files and registry entries to clean the machine so that you can reinstall into any directory. If you are not planning to reinstall the product, you do not have to clean your system.
You can reinstall the product without a clean system; however, such an installation creates a coexistence scenario that can prevent you from installing into the original directory.
Cleaning the system means deleting everything from the previous installation, including log files, that are left behind by the uninstallation.
Run one of the following procedures to produce a clean system.
This procedure produces a clean system. A clean system has no evidence of a previously deleted installation.