



To provide more security for users using Adobe reader, the company introduced ‘protected mode’ a while ago which is designed to launch the PDF file in a sandbox environment.

Also, make sure that you are logged in as an administrator. If you are trying to open a broken one or one which is malicious, the reader might not work. With the growing security architecture in Windows, this is very common and usually becomes a necessity after a Windows Update.īefore you start with the solutions, make sure that you are trying to open a valid PDF file.
