If it can't, can i install it on my system and then put in his old HDD as a slave . copy drive and then Copy it to the new drive.
Yes to an extent. That extent is how bad the hdd is. If it fails or crashes then then it might crash your PC.
The best bet (if it is that bad) would be to get it into your PC and copy the contents over you your HDD. Ghost might be too much work and trouble if the drive is really playing up.