Ian Grieve works through issues with Installing Microsoft Dynamics GP 2010 – Insufficient Privileges To Modify The VBA Project Error
Installing Microsoft Dynamics GP 2010 – Insufficient Privileges To Modify The VBA Project Error | azurecurve
Install, Upgrade & AdminDevelopment & IntegrationGP 2010
Archived post from 2011. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.