I did assigned the "default printer" to XPS Document Writer, but still get the same "This file could not be found" message.
I don't understand how this printer could help generate a PDF. Here's what Microsoft has to say about what it does:
http://windows.microsoft.com/en-us/windows/print-to-xps-document-writer#1TC=windows-7
"The XPS Document Writer allows you to create .xps files using any program that you can print from in Windows. Print to the XPS Document Writer when you want to create, send, and share or publish documents that you do not want other people to modify, or
when you want to print a document or display it online exactly as it appears on your screen."
No mention of enabling PDF.
Update: here is what MS says about the add-in:
https://support.office.microsoft.com/en-us/article/Save-as-PDF-d85416c5-7d77-4fd6-a216-6f4bf7c7c110?CorrelationId=b358379f-d059-41c1-92ae-bd6e00d0040f&ui=en-US&rs=en-US&ad=US
"You can use the Office programs to save your files as PDFs so you can share your files or print your files using commercial printers. And you won’t need any other software or add-ins."
This makes it appear that no other items should be needed.
I already have doPDF and also PrimoPDF, but there are some other issues with these. And what I really want to do is find out why I lost the "Save as PDF" function in Word, and get it back. While it lived, it was quick, convenient, and generated much smaller
files.