Hi Lisas,
Check if an update is available for Reader using "Check for updates" option under "Help" menu, reboot the machine after installing update and try again. You may also download updates from here: Adobe software and product updates
Also, try to add network directory as mapped drive to trusted locations under Security (Enhanced). You may refer to this KB doc for more info: Trust Methods — Acrobat Application Security Guide
Thank You,
Shivam