I had to re-install avast so I opted for the online installer. If you do not want Dropbox, don’t use the online installer. Everything was going smoothly and then I noticed Dropbox was being installed. No opt-in, no opt-out which sucks as far as I am concerned. I don’t need it and don’t want it. Avast!, at least have the courtesy to let a person opt out of the Dropbox install.
I even used the custom install to avoid all the extra crap like Grimefighter. and I still get a install I didn’t ask for. >:(