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Hi Paul

There must be a reason why CS3 is showing up, there's 2 other options that I can thing of

1 searching the registry for Photoshop CS3 entries, open regedit and select Computer and use ctrl + F key and search the registry for Photoshop CS3 entries and delete what you find.

Be careful to only delete CS3 entries

2 Use the Cleaner tool as mentioned by MrTom to remove all Photoshop installs and use RegSeeker to search for Photoshop entries in the registry

http://www.hoverdesk.net/download.php

You could also try CCleaner

https://www.piriform.com/ccleaner/download

Reinstall Photoshop CC

One more option would be to create a new user profile on the PC and see if you still have the issue!