Worst upgrade since Zone Alarm 2 years ago!!

I have spent all day trying to make this latest upgrade work. No luck!! I am quite worrried as I have installed Comodo on about 12 computers and I am just waiting for the phone to start ringing when people click on the upgrade button and their computer ceases to work any more. I have done 2 comp0let clean installs after removeing the old versions, inclusing running a registry cleaner. It still has broght my computer to a complete standstill. I must move on and I am now looking for a replacement. I will check bak here in the future to see if the problems have been resolved.
Angry (:AGY) (:AGY) (:AGY) (:AGY)
This is a Dell XPS with the Intel 6600 Intel cprocessor, Windows XP- SP2 and all current updates, NOD32, and Spysweeper.

Sorry you are having so much trouble.

Did you disable your other security apps before doing the upgrade? I used to have SpySweeper and had a lot of problems with it. Could be causing a conflict.