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Hello DrFunk
If you go to system admin/modules, to the right of each module is some icons and a checkbox.
To attempt to "repair" or update a module click on the first icon to the right of it, this updates the module
To uninstall a module, first de-select it by removing the checkmark or tick, and click "submit" further down. This just deactivates the module. It is no longer visible to users.
The next time you go in to the system admin/modules page another icon will appear to the right of the module in the "middle". Move your mouse pointer over it, and it will say "Uninstall"