Cannot deactivate W3TC to reinstall because of cache & rewrite errors

All of a sudden W3TC has cache and rewrite error problems, so I urgently need to deactivate, uninstall, and reinstall it. After clicking “Deactivate”, a message in the plugins dashboard said, “Plugin deactivated,” but the plugin still has a “Deactivate” link, but no “Activate” link and no “Uninstall” link, so it must NOT be fully deactivated. Since it is now unresponsive, how can I uninstall it?

Here are details of the two errors the plugin is now reporting:

W3 Total Cache error: It appears Minify URL rewriting is not working. Please verify that the server configuration allows .htaccess
Unfortunately minification will not function without custom rewrite rules. Please ask your server administrator for assistance. Also refer to the install page for the rules for your server.
Technical info
.htaccess file contains rules to rewrite url http://www.locatehome.com/wordpress/wp-content/cache/minify/000000/w3tc_rewrite_test. If handled by plugin, it returns “OK” message.
The plugin made a request to http://www.locatehome.com/wordpress/wp-content/cache/minify/000000/w3tc_rewrite_test but received:
200 OK
instead of “OK” response.

W3 Total Cache error: It appears Page Cache URL rewriting is not working. Please verify that the server configuration allows .htaccess
Unfortunately disk enhanced page caching will not function without custom rewrite rules. Please ask your server administrator for assistance. Also refer to the install page for the rules for your server.
Technical info
.htaccess file contains rules to rewrite url http://www.locatehome.com/w3tc_rewrite_test into http://www.locatehome.com/?w3tc_rewrite_test which, if handled by plugin, return “OK” message.
The plugin made a request to http://www.locatehome.com/w3tc_rewrite_test but received:
200 OK
instead of “OK” response.

https://wordpress.org/plugins/w3-total-cache/