Calm down, we can guide you.

There is not stupid questions. Only stupid answers ;D
Well, I think it’s better uninstalling Norton first.
Clean registry.
Uninstall avast.
Clean registry.
Make a full and clean intall of avast.

I don’t think you will reload it.
But not, you’re registered at Symantec and you can use the same registry key (number of days that you can update NAV will decrease). Well, it’s better check with Symantec support and, next month because they’re very fast ;D, say us what they said 8)