Is there a way for you to recover crucial data that has been deleted with hard disk data recovery software? There is always a chance to recover this data, it is always located somewhere on the hard drive, you just need to be cautious in the recovery approach.
You should always ensure that you perform back ups of your data on a regular basis.
Keep those back ups in a separate location, it does not make sense to do a back up of your hard drive onto that same hard drive, because although hard drives are much more reliable, if yours fails, how will you access the back up? Using hard disk data recovery software will assist in locating your deleted files and restoring your data to the original location it was deleted from.
Never download any recovery software before these measures:

• Partition your hard drive and create a separate drive to download hard disk data recovery software to so that it does not over write your data;
• Do not install recovery software onto a corrupted partition or on the hard drive that contains your data;
• Do not recover your data onto the same drive that was corrupted, it can cause fragmentation of separate files and corrupt the files you are attempting to restore;
• Only use good recovery software as there is but once chance to recover this data and you need to ensure you do it right the first time.
  

After the restoration of your data, whether you decide to install a new drive, or clear and repair the one your currently have, do yourself a favor and install the "undo" disks and diagnostic programs that will assist in restoring your computer to the original configuration if you have issues in the future.