I'd be more specific, but I am only going off remembering things I did when I worked on AutoCAD 4-5 years ago. I know things have changed, but it's a shot.
Basically in something like acad.ini file there is a listing of all the toolbars. It has numbers for the starting point of each toolbar so that you can move them and they show up there again next time you open autocad. The trouble is I don't remember if it is the acad.ini file or something else.
Someone else will come along and give a better answer.
I also remember that there was a command you could type into your command line and it would turn on ALL the toolbars. Once again, I'm blanking on the command. Sorry.