It sounds like you instrumented the disk on the windows side (which isn't supported - all PGP operations should be done on OSX). The procedure with PGP is:
1) Install PGP on Lion (do not encrypt or instrument)
2) Install PGP on Boot Camp (Win7 only on the new machines, do not encrypt or instrument)
3) Encrypt from Lion
You'll need to use the PGP Recovery disk to restore the correct information on the OSX side. The Windows side may be shot.
Also make sure you have the very latest version of PGP (10.2 I believe) - earlier versions brick machines on Lion.
I dumped PGP after years of buggy software, bricked machines, lousy support, outright lies by their management, and long delays in supporting new OSX versions. FV2 works just fine to encrypt the OSX side of the house - do you really need to encrypt your windows side?
And if so, then the second question is, do you really need to run boot camp instead of a standalone VM? The road you're headed down will lead to a long string of problems like this.
Whatever you do (and I know this is too late - not meant to be snide), make sure you have a good complete clone of your system before installing PGP, or applying any OSX patches (PGP tends to break and brick with updates).