Hi robertn15326761 ,
Sorry for the inconvenience .
Let us know the OS version on your system?
Try to repair the installation by navigating to Help>Repair installation .
Let us know the exact version of Acrobat you have .
Let us know if this helps .
Thanks. The version is 2015.006.30201
I tried the Help- repair but couldn;t locate it.
I'd be grateful for ways to repair asap. Thanks