Hi James,
To investigate the problem, we need to confirm several information.
- Since when did you encounter the problem, is there any option you've changed before the problem?
- You can try a clean boot in Windows to narrow down the problem, please follow the steps in this article:
How to perform a clean boot in Windows.
- Is there any error message when you try to open Project? If yes, would you share the screenshot with us?
Regards,
Tisky
Hi Tisky,
The problem first started after a windows update, that I can recall. I did try performing a system restore but it made little or no difference.
Ill try clean booting and update once done.
Error message attached, this appears when trying to open MS Project and happens at start-up:

As I say, strange that if I attempt a online repair it will load, but not if I run a quick repair, and once I reboot the machine it reverts back to this same issue.
Oh and I have also tried a re-install, direct from office365, I have an
Office 365 Enterprise E3 Licence.
Hope this helps
Regards
James