I guess that since you weren't logged on to windows there won't be anything in the windows event viewer.
avast.setup as you may be aware is the process that checks for updates, for it to be active at that point is strange. Is this happening at every boot it has it happened once only ?
If it is a frequent occurrence then it is worth trying to resolve, if it is the first time it happened, I would tend to ignore it and see if it does become an issue.
What is your internet connection type ?
I suspect broadband/always connected.
A recent update to the avast program improved the loading of avast services (loading earlier), I don't know if this is a possible cause, though for it to be a memory error is strange and probably unrelated.