I tried installing the trail version of Acrobat X Pro, and kept getting Error 16. This is the trial version I downloaded off the Adobe Website. I am running Windows Vista 32-bit with Service Patch 2. I tried uninstalling all my other adobe products, and then re-installing, but still got Error 16. I am the only user on my laptop so I should automatically have administrator privileges??? Any suggestions. I have gone back to Acrobat 9.0. I was thinking of buying Adobe X Pro, but if I can't get the Error 16 message resolved, I guess there is no point. Thankfully my acorbat 9 still works.