ิbefore you can do any work on the crashed drive you will need to remove it from the current machine and connect it to another machine as a secondary drive. The best way to do this is to use a USB to IDE/SATA adapter.
If you don’t have one available then you may be able to connect the drive to another desktop computer internally as a secondary drive. If you do, make sure that the machine detects the drive in the BIOS or you won’t be able to access it once the computer starts up.