Cannnot update Acrobat or Reader across entire company.

For more than a month now I have been unable to update Acrobat or Reader across my entire company. I am the domain admin at the facility however I keep getting the following on all machines. Error 1921. Service Adobe Acrobat Update Service (AdobeARMservice) could not be stopped. Verify that you have sufficient privileges to stop system service.

I am able to go into services and manually stop them, however this doesn't solve the issue. I get the same error if I attempt to uninstall the program to reinstall, as well as downloading straight from your site.

Any suggestions would be greatly appreciated.

Thank you