The flash download page asks you if you want to install an antivirus, I believe it's mcafee.

It's funny, though, that I encountered a "not so bright" person who simply told me "oh, I didn't know you could opt out, I was always uninstalling it afterwards".

You can also block the ask toolbar from downloading by killing toolbar.ask.com or the entire ask.com domain. It most certainly will not be missed.