Before performing the following actions (above):
- Are you managing your clients from an SEPM server?
- If so, do you have an uninstall password set?
-- Remove the uninstall password from the console settings (this will make your life much easier).
- Are all your clients running the same version?
- Did you initially deploy your machines with an MSI package?
- If you did not deploy with an MSI, you will need to create one before you can upload it to the ADC - GPO policy for uninstallation. It will need to be the same version (RU and MP) as the version installed.
After those things have been verified, follow the steps in the articles above (I did not check them myself, but assume they are pointing to the proper procedures).
Hope that helps.