This might help someone...
Since I was last on this thread, a few positive things happened.
1. I got a new system.
2. I got the old system back up. Fully intact.
As it was impossible to get into the Recovery Console due to my lack of a password, I took my C: drive and slaved it on the wife's machine. In Windows, I overwrote the corrupt files.
After returning the C: drive back to the DAW and with the Windows CD in the CDrom drive which I set as the boot drive in bios (I have no idea if this did anything for me), I started up the machine. It gave me a Windows dialogue box and asked me to update my password. I did so and Windows came up.
At this point, I went into Device Manager to see if there were any hardware problems and lo and behold, the drivers for the motherboard's RAID controller were corrupt. I downloaded the latest drivers and it was successful.
Now here's what I think happened:
When I put the DAW together, I had my audio drive set as master on the first RAID controller. The reason I did this was because I couldn't get it recognized as master on the second IDE bus for some reason (my CD burner was also on the secondary bus). So I treated the RAID bus as a third IDE bus.
I wonder if the RAID bus got wiggy enough on me to cause this corrupt registry problem as well as a few "Hard Disk Warning" messages in Sonar and some fluttery playback prior to the final insult. Anyway, that driver has been repaired and I have nothing on that bus. I'd like to disable it in bios, but if I'm not using it I wonder if that's enough.