Yes, as long as your drive doesn't have a physical problem, it is safe to use Data Recovery Wizard, because the program will not change anything on the crashed drive, it is a read-only software.

Install the software on a working Windows computer and attach the hard drive which contains the lost files as a second hard drive to this computer. Make sure that the second hard drive is recognized by the BIOS. You can use Data Recovery Wizard scan your drive. Depending on the the size of the drive this will take some time. After a while you will see a tree with you recovered files and folders. Now you can see whether Data Recovery Wizard has found the files. If the files are found you can evaluate the quality of the recovered files. Just select a file you are interested in and click "Preview" button. If the files looks okay, they most likely will be ok after you have copied the recovered files to a safe location on another drive.

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