blue screen of death

I recently updated my comodo pro firewall(to 3.9 i think). Since then my computer gives me what i think is a BSOD while booting and then restarts. I uninstalled it in safe mode, then did a complete reinstall in normal mode(with all antiviruses turned off). . The BSOD was back after that. What is going wrong? Is it conflicting with software already on my computer?
I have XP and run Avira antivir premium along with superantispyware.
I reallly like comodo , please help.

You should turn off all real time protection on your system before restart (it’s better - before updating) after cis updating, then make all this programs trusted