I was asking my question online because I found, like so many of these places, that a call to tech support put me in an endless loop. I would finally get a person and they'd refer me to a phone # that was the same as I started with. There were other useless loops also. While waiting for a reply here, I kept trying anyway on the phone since it was toll free. FINALLY, I got through to someone ... of course they don't ask what you want up front ... they want a world of info first and in my case, all but the unit's serial number was unnecessary. Anyway .. the guy assures me that an A105 S4064 (the Toshiba sticker on the bottom of the laptop) is the same as the A105 S4061 that comes up online and on his computer. I hope so.
So for now, I guess I have my answer. Now I just wait for the disk to get here.
Thanks, Larry