Oops! 7 Home Premium (6.1 Build 7601 SP1) Apologies for leaving that out.
Thanks, XXXXX XXXXX
My question in brief was "can I fix with no install CD?"
It appears your answer is "no."
Because I've misplaced the install CD after a move, I can't do a repair (Windows requests the CD to do a repair).
Unless you have another suggestion, I'll keep unpacking until I track down the CD :-)
Thanks for the heads up, Richard! Hadn't run into not needing the disk before, so I tried it and...it requests disk :-(