OK, so I force removed the old version, cleaned up the reg and reinstalled 7.3 and it now works.
C:\Program Files>cd calibre
C:\Program Files\Calibre>calibre-debug -g
calibre 7.3 embedded-python: True
Windows-10-10.0.19045-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.19045')
Python 3.11.5
Windows: ('10', '10.0.19045', 'SP0', 'Multiprocessor Free')
Interface language: None
QPA platform: windows
devicePixelRatio: 1.0
logicalDpi: 96.0 x 96.0
physicalDpi: 91.84180790960451 x 92.05369127516778
ApplicationPaletteChange event ignored
Using calibre Qt style: True
[0.00] Starting up...
[0.01] Showing splash screen...
[0.20] splash screen shown
[0.20] Initializing db...
[0.76] db initialized
[0.76] Constructing main UI...
[1.56] GUI main window shown
[1.83] main UI initialized...
[1.83] Hiding splash screen
[2.01] splash screen hidden
[2.01] Started up in 2.01 seconds with 1 books
Lost my plugins etc but I can add these back....
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