I forgot to move the docs this time.
I hooked up the HDD to another machine, ran chkdsk with both options checked (automatically fix errors, etc), and after chkdsk running on the next boot before windows opens, there's still a STOP error when I boot from the HDD.
I can access it as a slave without any errors from the other box, so I guess it's an error in the OS/boot section.
I can install the OS on the other drives without wiping out the stuff already on them?