Use passwords made up
of letters and numbers and change them occasionally (if your memory is
poor, use a method for the changes)
Install/apply spam
filters
and if you do receive spam messages, delete them immediately
Install anti-spyware
and anti-virus software and keep it up to date (see July 2008 entry
above)
Ensure home wi-fi has
a password and firewall and/or WPA encryption
If you suffer an
online fraud, report it to your bank, the police and the retailer you
used
Ensure your
computer's firewall is switched on.