No, the problem happened when I tried to create a more recent image. The process aborted part way through and left me with the no OS problem.
Then, I tried to restore from a previous Ghost image I knew worked, since I had used it successfully before. That image was fine, but I could only boot to it if I used my XP boot diskette in A: first.
Then, I applied the solution described in my links - making my C: drive active - and now all's well.