Hello @Anne Corcoran
Open any Office applications> Help in the top menu> Check for Updates.> then reboot your PC
If its MAC OS then please have a look on below Microsoft article
https://answers.microsoft.com/en-us/msoffice/forum/all/user-does-not-have-access-privileges-when-opening/bfd30ffc-bdfd-417c-bb12-1039fb5085bc
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