Thanks Alex,
1ste time the uninstall-tool has given a message: it could not complete de deinstallation. I checked : 2 directories (incl subdirectories) were still there....
...Yesterday, I phoned my 72-year-old mother (who lives 600+ miles away) to walk her through the very straightforward process of uninstalling Kaspersky and installing Bitdefender Total Security....
...If issue persists, uninstalling and reinstalling bitdefender product is advisable. If issue still persist, you will have to contact bitdefender support.
Regards