Many thanks to Dafydd for obtaining the following instructions from Cyberlink which resolved the problem.
Please try the below steps to remove PowerDirector.
I. Reboot PC.
II. Install Microsoft cleanup tool and clean PowerDirector installation informaiton
Install Microsoft cleanup tool and execute from "Start\all programs\WindowsInstaller Cleanup" To check if PowerDirector is
on product list, If you can see PowerDirector in product list. Select PowerDirector and click "Remove" button to clean up PowerDirector.
The Microsoft cleanup tool can be downloaded from:
http://download.microsoft.com/download/e/9/d/e9d80355-7ab4-45b8-80e8-983a48d5e1bd/msicuu2.exe
III. Remove PowerDirector folder and clean up PowerDirector Registry
Please try the following steps.
1. Remove C:\Program Files\CyberLink\PowerDirector folder
2. Remove C:\Program Files\InstallShield Installation Information\{CB099890-1D5F-11D5-9EA9-0050BAE317E1} folder
3. Run regedit (Start --> Run --> type "regedit")
(1) Remove HKEY_LOCAL_MACHINE\SOFTWARE\CyberLink\PowerDirector
(2) Remove HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{CB099890-1D5F-11D5-9EA9-0050BAE317E1}
(3) Remove HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\InstallShield Uninstall Information\{CB099890-1D5F-11D5-9EA9-
0050BAE317E1}
(4) Remove HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\InstallShield_{CB099890-1D5F-11D5-9EA9-0050BAE317E1}
Note: Before execute item2, please make sure user has enabled "Show hidden files and folders".
Having successfully removed PD, I then re installed PD6, then the PD7 upgrade & finally the 2206 patch.
All is now working fine.
Best regards
John