Thanks for the response, Nemesys,
Well, that's the program that's on there, I tried a keyfinder, and it brought up all the program keys on the computer. It verified the XP key, the Sonic key, the Microsoft Office Enterprise 2007 key, and a couple of others. All the others were accurate, (matched the COAs on the labels), I couldn't verify the Office one, since I didn't get the disk. It gave the usual 25 digit/letter type key, so I would have to assume it is the right one for the program that was installed. Maybe the trial versions have different codes, I don't know.
I did see the Office Enterprise 2007 version available for sale individually several places online, and I did see the sort of blanket purchase availability you mentioned, but they offered that for all of the different Office applications, not just Enterprise. I had never even heard of Enterprise before, but Office Pro 2000 is the latest version of Office available to me, and I thought it would be nice to be able to use the newer 2007 program on this computer, but know if it ever goes down, I've probably lost it forever. I made an Acronis back-up of the C drive last night, but you know how that goes, if you ever need a back up, it usually turns out to have only copied the shortcuts or something didn't copy right, and the disk won't work, etc.
Again, thanks for the response, best wishes,