Some new information.

found how to select hard drives at boot, with his MB, it's F9. It
did no good as both drives booted Ubuntu without a Grub menu.

Windows was still there, we could mount the partition and look at his
Windows files.

I tried restoring Windows boot loader with "bootsect /nt60 C:" at the
Windows 7 system restore command line. The command reported success,
so we tried booting. Got Grub again. But the Grub menu was there! No
option for Windows though.

Some more searching with Google brought the suggestion that we try
"bootsect /nt60 /mbr" if what we tried did not work, which the
original instructions we found did not suggest.

We're going to try that and if it works try to reinstall Grub and see
what happens. We are considering downgrading to 9.04 and seeing if
Legacy Grub works.