After updating COMODO blocks system WinXP2. Any program does not open. All is braked and hangs.
In a safe mode when COMODO it is not included all works normally. 
What I can do?
Please see this thread, it may explain the cause of your problem and offer a solution
https://forums.comodo.com/empty-t46150.0.html;topicseen
All the best, woz of oz