togna on "BackWPup + Better WP Security = Internal Server Error"

BackWPup + Better WP Security installation gave '500 Internal Server Error'

I'm creating my website so it is not on line yet but only in my localhost under WAMP. I just installed BackWPup and Better WP Security with the result that neither my website nor my dashbord wp-admin are accessible anymore, the only thing I get is 500 Internal Server Error.

I have spent one day looking for the solution: I have deleted the plugins from C:\wamp\www\namewebsite\wp-content\plugins and deactivated all the plugins in MySQL table wp_options writing a:0:{} in the active_plugins field, ... still no change.

Please help, I am desperate.
Thanks,
Togna