After I sent my question, I found it at
http://www.ubuntu.com/server/get-ubuntu/download and downloaded both 10.04
and 10.10 before realizing I had the wrong ones. So I went to the address
you gave, and I see that there's a desktop version and a netbook version. I
have a laptop, and when I make the font big enough to see, I have to scroll
around a lot to see the whole page. Being that the netbook version is said
to be designed for smaller screens, would that be more appropriate for a
laptop, though it's a full-sized laptop?

I notice that Windows 7 has its own image burning utility, so I guess I
won't need that.

So after I burn the ISO image to disk, and verify it, if I partition and
install from the CD I burn, will my Wubi-installed /home on its virtual
partition be safe and sound for me to recover, or will the new installation
wax those files?