Cannot save my configuration

Hi !

I have Windows Vista Home Premium 32bit and Comodo Firewall
Under “Manage my configurations” I want to save my configuration. I chose “Export” and then “Comodo - Optimum Security” but nothing happened. No pop-up where to save the file.
Or can you direct me to the location where the config file is saved so I can make a backup of it.
Can you help me ?

Resolved !!!
After I rebooted the computer it worked.