The ICF will never "give me enough security" - as it only works one way
(incoming traffic only) - if you want "enough security" you will need to
purchase - and configure - a third party solution.
Alternatively, you could download and install the free
version of ZoneAlarm, which would be an improvement over
the Windows XP firewall.
To download ZoneAlarm, go here: http://tinyurl.com/iwhb
HTH