If you are dependent on the data that could be lost, then you need to preserve the faulty disk as it is and not make further changes. to it, ie. don't run the PC until you have resolved the problem. Your best bet is to get a new drive to replace the corrupted one, and use the original as a usb attached drive (you will probably need a caddy) and make sure you do not write to it. This is all quite involved and possibly beyond what can be done via a forum, you may need to seek help from a computer repair specialist. However, maybe others have better advice.