Enable BitLock

Hi guys,

I'm trying to enable BitLock on a Compaq 6515b notebook which has built-in
TMP 1.2. There are 2 partitions on it, one is 2GB and another is 30GB (both
of them are primary partitions). The Vista Ultimate 64bit is installed on the
30GB partition. All drivers including TPM drivers are installed correctly and
the notebook works quite well. But when I try to turn on BitLock in Control
Panel, there is always no volume available for BitLock.

Is there anything wrong with my settings?

Thanks a lot.

--
Regards,
R. Yang