I can't figure out how to add an image to my post, other than upload the image to the web, but I got the Chrome prompt this morning again, and as I'd thought, it's really simple. Only choices are install chrome (y/n), if so, make it default (y/n), and click "Finish."
Each morning this week, I've unchecked the install box and clicked finish, and the popup is there the next morning.
Lots of people appear to be similarly plagued:
http://forum.avast.com/index.php?topic=94239.0 appears to have a fix which I will try today.
Meanwhile,
http://forum.avast.com/index.php?topic=100770.0 asks some questions I'll answer here:
1. What avast! edition are you using (ie Free, Pro or AIS)?
Free, 7.0.14512. When did this happen (during update or new installation)?
Since I updated from prior version earlier this week3. What Windows version are you using (ie Win7 SP1 64bit)?
Win7 Professional, 64-bit4. Which was your default web browser at the time this happened?
FF 13.0.1
5. Have you ever installed Google Chrome yourself in the past (and then removed it)?
Never6. How did this happen (dialog quickly disappeared, missing checkboxes etc)?
As described here, it appears after every restart and login7. When did this happen (right after update, after update reboot, both)?
As described here, it appears after every restart and login8. If you think any other info might be relevant or helpful, please post it.
I've done that in this thread, as have other users with this problem.