Hi there and welcome
this is the best course of action, download the Adobe Cleaner tool from my link below
Once done, restart the computer and install Adobe Reader from my link below and it should then work correctly.
I can also do these steps for you, and have made a request via Additional Services. This is optional, and if you choose to do this, I can, with your permission, remote into your computer while you watch and do all these steps (and deal with any problems that arise during them) for you. Or if you do not choose to take this service, we can continue here. This is no problem at all. Just let me know please.
Else let me know please the results.