Didn't you uninstall the old (paid?) version before installing the new free one? It might be better now to uninstall both and start from scratch with the free one.
Better wait for an AVG representative to tell the details on how to do that.
By the way, if your old version expires you must have had that a year. Then you have a full year experience. Then you shouldn't say you're new at computers.
I just installed the "free" AVG & in a few days my old version is expiring. I'm new at computers & I get an update that my old AVG is expiring. How do I know if I have protection on my new version?