Just thought I'd make you all aware of a problem with Avast and a solution for it. It seems that the very latest version of Avast does something that will not allow DBP exes to run. It gave this error message:
"the applications was unable to start correctly (0xc0000005)"
To fix it (do this at your own risk, though I checked the Avast forums and it
seems safe), go to the control panel and go to add and remove programs, and select Avast from the list. Click uninstall/modify and then click "change". Under "shields", uncheck the "Behavior Shield". This did the trick for me. Apparently that shield isn't all that necessary, and I think they are going to update Avast to fix this problem without having to disable it.