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Installing a new version of Adobe Reader e.g. 9 or unistalling an older version can sometimes bring up the Error : Internal error 2753. Updater.api-NON-OPT during installation and not install Adobe Reader .. Useful!! To get round this error Download the Windows Installer Cleanup Utility package , install , and open through Start , Program Files , Windows Installer Cleanup Utility Find any old Versions of Adobe Reader in the list and remove them, once this is done , rerun the Adobe installation or un-installation