I'm not familiar with Kerio so this may not be the ideal solution.
I'll assume you're using Windows XP.
Create a short cut to Kerio - Start; All Programs. Right click on Kerio and left click on Create Shortcut (send to desktop).
Now move that shortcut to C:\Documents & Settings; All Users; Start Menu; Programs; Startup.
That should allow Kerio to run each time you boot up.