If it has gone to the stage of the HDD being unable to be accessed by Windows / OS of choice - It is probably beyond any software's ability to reclaim the data.
There are specialist HDD data retrieval companies - Expect to pay £200 ~ £500 depending on the popularity of the drive in question tho.
One thing to try - Stick the drive in the freezer for an hour, then try again.
If it works until it's heated up...
Freezer -> Copy -> Freezer -> Copy etc.