Did you try running the AV updater after you copied the bases.cav in Safe Mode? Because there still would be a dozen or so, small, incremental updates.
Yea, I did and I noticed the main file size had increased from 80.1MB to 82.6MB during the time it too me to download the offline file of 126MB. After copying that to the designated location, update still started from square 1 with the AV database status showing as "Never updated". I even waited still the update process reach about 10MB where I concluded it was take the whole stuff online again.
Imagine having to download 85MB of update only to see the connection go off and have to start all over again, which is what happen to me.
I got comodo because of the firewall which I can't find. I think the AV is good but with update a problem, Avast would surely be welcoming me back.