With the Firewalls Off, the IP's set, the above changes, the Ping being successful, I still can't get into the other's files from either computer. I double-checked settings, tried various troubleshooters, etc. and think I should just give up, unless you have some other great idea. Not sure what changed since it seemed to be partially working, and I can't seem to find it.
Maybe when I get more free time, I can review this thread and start over, going through all the steps at once to find where any problems are, if I've made any (or missed/undid something). I currently have some new paperwork I need to get to, and have been putting off, partly because of this.
I appreciate the help, but am just running out of time and energy.
Think I need to remove the space key to find out ifthere's some dust under it that compressed air doesn't blow out.