I recently upgraded from Window 8 to Windows 10 and found I couldn't export to pdf from InDesign. The error message I received say it was due to an unknown error. I even tried printing to pdf as a back up and it didn't work. I have Adobe Acrobat DC installed and am a Creative Cloud subscriber with all applications.
Later today, I reverted back to Window 8 thinking that would solve the problem, but I still get the same pdf cannot print due to unknown error message. I called Microsoft and they said to call you. I have been working on this for two full days and it is impacting my production deadlines so I am desperate for help.
How can I get InDesign and Acrobat restored as a Creative Cloud member?
You should never print a PDF from InDesign, only export.
Important to give answers you have to inform us on:
Is this a problem for a particular document, or are you unable to export a new document as well?
If it's restricted to one file, see Adobe Community: File Crashing on Output - printing/PDF/other for some troubleshooting steps, as well as Remove minor corruption by exporting for steps to remove minor document corruption.
If you are completely unable to to export PDF from any file, see Replace Your Preferences