I am sorry for your loss, but I am afraid there is no way you can get it back.

After that, I moved to multibit and saved it on several USB-Sticks with a strong password using KeyPass obfuscating. Is there anything else I have to take care of?
Don't go to some strange websites.
Don't click strange links.
Don't download strange email attachments and files.
Switch to an offline wallet when one day you have a significant amount of bitcoin.
