Yeah, that's where I got 17.9 GB from, looking at my "C" drive in Windows.
I actually ended up dragging the temp install files to the desktop and running it there. It worked perfectly. I have no idea what was up with that one folder...
Thanks. I found a copy of Adobe version 7.9 to download. It installed without a problem. I presume that that version will eventually ask if I want to upgrade to version 8 or whatever.