OK. Thanks for all the advice and suggestions.
I now have both cores running. Didn't have to install or repair or anything
like that.
I got a suggestion from someone off-group and it worked.
1. In msconfig, go to "Boot" and "Advanced options."
2. If "Number of processors:" is checked, uncheck it.
3. Check "Detect HAL"
4. Reboot.
5. System comes up, flails around for a while, says it's installing a device
driver, and tells you to reboot.
6. Do it.
7. In msconfig, go to "Boot" and "Advnaced options."
8. Uncheck "Detect HAL"
9. Check "Number of processors"
10. Select 2
11. Reboot again.
That's it.
I now have both cores working and the system is notibly snappier than it was
before.
Again, thanks all.
It's been quite an adventure.
- Bill