errors when opening a PDF in outlook 2016 on a VDI

looking for help from someone. we are using Adobe Acrobat Reader (whatever the latest version is) on a VDI. the issue is every time we run an update the next morning the end user, when trying to open a PDF from inside their Outlook (we are on o365), they get the first error, saying that Acrobat cannot open the file in Protected Mode due to incompatibility. you click to tell it to open with protected mode disabled and 

You get the next error "Acrobat failed to load its Core DLL"

you click OKAY and adobe reader closes. the only way to open the pdf is to download it and open it. the preview function works fine though, just trying to open it (from outlook) and only if you are on a VDI.