Hi nausm,
Is this issue specific to the pdf files or do you face the issue with any pdf you try to open?
Which application was used to create these pdfs?
Have you updated Acrobat to v11.0.7 and checked?
Are you able to launch Acrobat standalone app without clicking on any pdfs?
You are getting error related to specific fonts because the document might have the fonts that are not available on your computer.
Regards,
Rave