Well the support alert you to common problems at other operational systems…

You mean, day, month and year (not only the hour and minutes)?
This is a virus behavior and you won’t be able to register avast if your system is with a ‘future’ date.

No, avast did what it’s supposed to do. Change your email settings to scan it.
avast will change the servers to 127.0.0.1 as you could see at your email account settings. It’s not a ‘screwed up’ action. It’s the normal behavior.

Well, we will be always here to help you. As you can imagine, you will lost the great avast features compared to AVG: incredible fast updates, very best rate of detection, skins, etc. 8)