The silent uninstaller runs in the background. The process can take a while. The silent uninstallation fails if you incorrectly configure the properties file or if the installation directory is not accessible.
After you uninstall the Informatica clients, delete any remaining folders and files from the Informatica installation directory. For example:
Informatica _<Version>_Client_InstallLog.log file
Log out of the machine and log back in. Then clear the Informatica-specific CLASSPATH and PATH environment variables.