Decrypt With Only Key

I've recently inherited a handful of PGP Desktop Whole Disk Encryption encrypted laptops. I have a laptop from a terminated employee and have only what's listed as the PGP Key, but not a passphrase. The disk is listed as 100% encrypted.. I have found 2 CD's which appear to be PGP recovery disks for this PC, but when I load them, it just lists PGP recovery disk press any key to continue and then brings me back to the same passphrase prompt wshenever I hit a key.. I need to access some files from the system, what are my options? Is there a way to use the key without the passphrase to decrypt?? (version is 10.2.0)