PDF Reader for Windows 7 is a fast, lightweight freeware reader that can display and print PDFs as well as convert them into a wide range of other formats.
Adobe Acrobat Reader DC is the industry standard for viewing, printing, signing and commenting on PDF documents. It's the only PDF viewer available*, which is able to open and interact with all types of PDF content, including forms and multimedia.
Adobe Reader Free Download For Windows 7 Latest Version

Working with Adobe Acrobat Reader DC is easy, as it has some very cool tools to work with. With a modern, tabbed viewing interface that allows you to view multiple documents from within the same window, and apps and tools that can enhance viewing, revising and annotating documents, you are sure to improve your workflow. Key features include: • View and annotate PDFs. • Add comments.