dual system cannot bootup after encryption

My laptop is thinkpad t440p, and installed windows7 and fedora21 in order as a dual-boot system machine and the PGP is running on the windows.
I used partition encryption mode to encrypt windows 7 boot partition(which is c:), leave fedora21 un-encrypted.
Without encrypting the windows7`s partition everything works fine.
After the encryption I just cannot boot into fedora any more, but it`s ok for windows.
I can get into the fedora`s boot menu(where I can select and boot up windows), but can not start up fedora and with no message to hint where is wrong.
I have tried using grub command line to boot fedora with the following commands:
>set root=(hd0, 3)
>linux16 /fedora-kernel(I don`t remember the full name, just as the follow command)
>initramfs16 /...img
>boot
and I got the message:
"Probing edd (edd=off to disable)..."
something like that and frozen!