It says:Go to Start/Search and type diskmgmt.msc. Right click the diskmgmt results and Run As Administrator. In the Elevated Disk Management window, do you see your drive there? Does it say it is Unallocated Space or does it say that the Disk is RAW?
If so, you can try and recover your files by using the free TestDisk Program. I have had the best luck with GetDataBack. You will need another drive of the same size or larger to recover your files to.