Comodo Firewall keeps resetting the computer.

I’ve got a real big problem and i need some help.

I downloaded Comodo Firewall setup program on my brothers computer and installed it,at the end of installation it said something along the lines of press “OK” to “reset your computer to complete installation” ,well i pressed ok and then thought it would reset and i would just open up the program and put in the activation code and it would be up and running but what happened was my computer came back to desktop but after about 20 seconds it resets itself and then when it loads up and gets back to desktop it resets itself again and so on.

I don’t know much about computers and really need help with this,he doesn’t know i’ve broke his computer yet and i have to sort it out as soon as i can.

Please Help.