This script is what I currently use for the exact purpose your talking about JAunmc.
start "PGP BootGuard Bypass" /MIN /WAIT "C:\Program Files\Pgp Corporation\Pgp Desktop\Pgpwde.exe" --add-bypass --disk 0 --admin-passphrase yourpasswordhere
I push this script to all of my laptops, then 5 mins later run a force reboot command. The laptops then come up to the windows log on screen so additional patching can run.
One thing to note that I've found after lots of trial and error is that this PGP bypass can ONLY work if the user that has PGP rights to that machine is logged on when the script is run. I've tried it if the user is logged off or if someone other then the main user of the machine is logged on and the script will not work.
I've never had a problem so long as the user of the laptop is logged on when the script runs. Has to do with PGP and who it grants admin access to. If someone else is logged on then the PGP desktop will not allow anyone admin access to it.
Hope that helps.
Larry