Lauo if you really have a PC and not a Mac you are probably on the wrong site. FineTunedMac is strictly for Apple Macintosh computers.
However, in answer to your question, a fall such as you described may well have physically damaged the hard drive mechanism itself in which case it is highly unlikely any software on the Mac or a PC will be able to recover your data. In that case you are going to need the services of a data recovery firm such as DriveSavers
and the investment of anywhere from several hundred to a few thousand dollars.
At this point your best chance is to to take the drive to a reputable repair facility and ask them to diagnose the problem. Even that is likely to cost you $60 to $100 or so.