Decrypt a whole disk that isn't initialized

Hello,

I recently had a PGP encrypted hard drive that would no longer boot.  I ran a windows utility that fixed bad sectors (it says it found 800 bad sectors and fixed them), and I think that process made things much worse.  After that, the disk wouldn't even be found by the computer.  I have since installed a hard drive utility (HDD Sentinel) that was able to find the disk but tells me that it isn't "initialized".  If I initialize the disk, I'm afraid I'll lose everything (though i'm guessing it's probably already too late).  Is there any way to decrypt a whole disk that is not even being recognized as initialized?  Obviously it's currently not even showing up with a drive letter in Symantec Encryption Desktop.