:slight_smile: This is a well known bug in windows xp and no real fix except have a password on switch on and also if you log off and then log on it will fix its self.
Do google search and you will see a well reported problem.
IF RUNNING COMODO BO CLEAN THEN YOU CANNOT SWITCH IT OFF IF SYS TRAY ICON NOT SHOWN.

i have found having less at start up makes a big difference ;D