Office 2007 - Can't Save as PDF

Up until a couple of weeks ago I had no problem saving Word documents as PDF.
Suddenly I started getting an error message: "This file cannot be found."
This happens with every doc I try, including new docs created to test the Save As PDF function.
I have deleted the old Save As PDF app (or program, or feature, or whatever you want to call it) and downloaded and installed the newest one from MS. Same result.
Any clues on how to restore the functionality of this feature will be greatly appreciated.

See if this Microsoft "Detect and Repair" function helps. There are two separate procedures depending on if your Office uses menus or ribbons.

https://support.microsoft.com/kb/924614/en-us

Thanks but this seems to be a dead end. I went to the link you provided. From the instructions on the page:
"To run the Detect and Repair feature in your 2007 Office programs, use one of the following methods, as appropriate for your situation.
"For 2007 Office programs that use menus [I DO NOT HAVE THIS TYPE]
Start the 2007 Office program.

1. On the Help menu... MY VERSION HAS NO HELP MENU SO THE REST IS NOT APPLICABLE

"For 2007 Office programs that use the RibbonStart the 2007 Office program.

1. Click the Microsoft Office Button, and then click program_name Options..." THERE IS NO SUCH PATH OR OPTION, SO THE REST IS INAPPLICABLE.

If it was my computer I would completely uninstall Office 2007 and reinstall a fresh copy.

http://support.microsoft.com/KB/928218