Hope you are doing well and sorry for the trouble.
What happens when you try to start the Acrobat Reader DC application? Do you get any error message? If yes, please share the screenshot of the same for a better understanding.
Adobe Acrobat Reader DC is a freeware application. It is used to read, annotate, and fill and sign the PDF files. For more information please check the help page - https://helpx.adobe.com/reader/faq.html