Following have been noticed:
1. When one tries to select any printer other than the HP Color LaserJet CP2020 as default, nothing happens.
2. When one tries to select the HP Color LaserJet CP2020 as default, following error message is seen: "Operation could not be completed (error 0x00000709). Double check printer name and make sure that the printer is connected to network." Needless to say that the printer is connected to network and I am able to check it by its IP address.
Anyway, even if no printer can be selected as default, different outcomes are seen for different usages as follows:
Printing Word document(docx), Powerpoint (ppt)
> 'Fax' appears as the default printer
> It is possible to select the CP2020 from the dropdown list of printers
> It is possible to print the document in CP2020.
Printing Excel document(xlsx)
> 'Fax' appears as the default printer
> Although the CP2020 printer appears in dropdown it is NOT possible to select it
> Obviously, it is NOT possible to print in CP2020.
Printing Acrobat documents (pdf)
> Although deleted, the HP Officejet Pro 8000 A809 appears as the default option
> CP2020 printer DOES NOT appear in dropdown list of printers
> Obviously, it is NOT possible to print in CP2020.
Just in case if it is of any use kindly be informed that in Registry, HKEY_CURRENT_USER/Software/Microsoft/Windows NT/CurrentVersion/Windows it is seen that under "Device" still the old (deleted) printer (i.e., HP Officejet Pro 8000 A809) is appearing.
Searched in this forum and also googled for any solutions. However, no success yet.
Thanks for any help in resolving this problem.