Web Site Backend Admin Broken

[Jos]

I am not sure if it is just a case of FTP’ing to the server and deleting these directories

Yes that will do the job (all three at the same time)

[velden]

And CGExtensions cannot be uninstalled because other modules depend on it. Of cource you could first uninstall those dependant modules. I would expect CGExtensions can be uninstalled after that.

I think that might be a better way than removing just directories because it gives the uninstaller a chance to clean up the database.