Computer Won't Boot, Getting All Kinds Of Error Messages?

I've tried booting up another one of my computers. it says that there is a disk error and to hit ctrl, alt, delete to restart. Did that a bunch of times and still wouldn't boot. I took the System Recovery disk from my Compaq (bad drive is in a HP, can't find the boot disk for that system) and changed the boot order and the CD won't boot. Tried safe mode, last known good configuration and tried to scan the disk and it doesn't complete and gives another error: :windowssystem32configsystem missing or corrupt

So I took the information from this link, option 4 towards the bottom Help2Go saying to take the bad drive and put it into a good PC running XP. So I got up to this point "You should now be back at the “My Computer” window. There, you should also see another hard drive listed. Open that drive. " so I double-clicked the bad drive and after a while I get, "Disk is not formatted, Do you want to format it now?" if I format it, how do I get Windows back to the HDD? Keep it in the Compaq as a secondary drive and use the Compaq System Recovery disks?