Thanks, MJ.
Apologies for my prolonged absence, but Win7 arrived and just
needed to be installed and tested. After all, I've been using it's ancestors all the way back to Win95 (and OS/2 before that).
What a disappointment - not only did it manage to render my newly installed Mepis system unreachable by peremptorily overwriting GRUB in the MBR, but it refuses to recognize my sound card! And I'm less than impressed by the UI. It may stay on the machine as option B - if I get really stuck, but it ain't my OS of choice.
I'll probably give Fedora a try when I stop "playing" with Mepis, which is so far ahead of Ubuntu that I've recycled the live CD as a beer mat.
Anyone want to buy a set of Win7 installation DVDs? One (fairly) careful owner, low mileage (been used once), not even registered with MS.