Cannot start winxp

Hello! sorry for my poor description

I have 2 same os (same cd win xp pro sp2) running in my computer, drive c and d.

The problem is os drive c cannot be started with this error message '
windows\system32\config\system being missing or corrupted', able to repair it with winxp cd.

I have no backup file/boot disk saved, here a simple describe bellow
os drive c: cannot start but device driver installed
os drive d: start properly but no device driver installed yet (new install)

But this method didn't work because no repair for c available in setup, only d available, maybe c is too corrupted. Any other method but full format?

Additionally, my os d is working properly but the driver for device like sound and other not yet installed, no sound. So I wonder is it possible to copy paste the driver from c back to d and then reconfiguring the setting so that no need download again. If possible, how?

Please help with step by step detailed instruction about what to do, thank you very much for reading.