Have you tried installing an old version of Xara and seeing if that works. Based on what you are describing I don't think it will make a change unless it fixes something in the registry.
Download Libreoffice and install, there is no charge you can make a donation if you want. In Writer you can import PDF and check and see if that works. The link is:
https://www.libreoffice.org/download/download/
I think that if Libreoffice works then you are going to have to have a program that can do a deep uninstall of Xara. When you do a regular uninstall it does not get all of the settings in the registry so you would need a program that does this. You probably have some setting that is corrupted and will not reset during reinstall unless it is fully removed. I have had this happen before with other programs. I have not had to do this in a number of years so I can't recommend a program now that does this type of work.
Ray
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