Our recommendations:

- use secure passwords (uppercase, lowercase, numbers, special characters)

- change your password periodically / passwords should not be older than 3 months

- store passwords in a safe place as well as USB storage media

- perform a backup of the data on a regular basis -

- switch off the bluetooth function (if not required)

- encrypt confidential e-mail attachments

- set the screen saver with a password

- enable anti-virus software and update virus definitions on a regular basis

- install security updates for the operating system and applications on a regular basis

More information is available at:

http://www.cert.org/
http://www.bsi.de/
http://www.heise.de/security/