(Please do not use your email openly anywhere in the web)
Simplify means this one ? http://wordpress.org/extend/themes/simplify
You can log in to your FTP and rename the folders by adding a dot ( . ) before the folder name to deactivate. Like :
For All Plugins -> plugins folder under wp-content, add a . before plugins -> .plugins
When you will remove the dot again by renaming, they will appear as deactivated plugins.
For themes - > Go to themes folder, add dot to specific themes except the default theme (to test).
