comodo system cleaner has stopped working

When I upgraded from v. 2.2 to 3.0, CSC crashes in the middle of system clean-up. I get the following message: “comodo system cleaner has stopped working. a problem caused the program to stop working correctly.” I am running Firefox 3.6 and Avast anti-virus, as well as Spybot S&D and Malwarebytes. Are there certain settings I should be using with CSC?

I’m having the same problem except this is the first time using it.