Hope you are doing well. Sorry for your experience with Acrobat DC and the delayed response.
Would you mind trying to repair the installation by going to Help-> Repair Installation?
Also, since Windows 7 is now End-of-life for support, the application and its functions may or may not work to their full capacity on the platform.
We suggest you upgrade your Operating System to at least Windows 10 to utilize the application's full abilities.
You may refer to the given link to learn more about the minimum system requirements for Acrobat: Adobe Acrobat system requirements supported platforms
Hope this helps.