I have Sysgate personal firewall installed and am constantly informed my
computer is at risk because no firewall is turned on. How do I let the
security centre know that I do have a firewall installed and doing its job.

You should open the security center and go to firewall..go to recommendations
and choose I'll chose firewall that i will monitor by myself...and you will
not get anymore security center warnings that you are not protected. NOTE:
in security center...it tells you that it doens't detect all firewall
programs...


NOTE: Windows doesn't detect all firewalls (in security center)