Card is "Read Only"

You are trying to load a certificate to the card, but Windows returns with a "Read Only" error.

To write to a Card (for example to load a certificate or generate keys) you need to install the PIVKey Minidriver.  This can be done using the PIVKey Admin Installer, or the PIVKey User installer. You will get the "Read Only"  error if you have not installed the PIVKey Minidriver, or if there is a problem with the installation.

The PIVKey Minidriver installers are available for download here.

For more information see the following articles:

PIVKey Deployment Overview

And:

Testing the Admin Install