Hello Joshua,
I recommend reading through and attempting our standard recovery procedures.
The recovery procedures are available at the link below.
http://www.symantec.com/docs/TECH149679
I understand you have likely already attempted some of the steps. However the recover document is fairly comprehensive, and lists most options available for recovery :)
Have you attempted to slave the drive to a second computer where you have Symantec Encryption Desktop installed yet?
Section 2 in the recover article above describes how to use the commandline recovery options once you have slaved the drive to a second computer with SED / PGP Desktop.
This is always a good option, as you can use a commay prompt to get more data about the status of the drive.
The pgpwde Enum and status will give you an indication of wether our not the encryption data is available. If it is not available you may want to try pgpwde --recover --disk x
If the partition table is damaged the recover command will look for a second copy of that data, which should be written to a random location. It may take a while to run as it will search the drive from beginning to end.
Regards,
Phil