I have an HP laptop with a TPM 1.2 level chip. I have successfully encrypted the C: drive with bitlocker. The OS is 32-bit Windows 7 Ultimate. However, every time I boot it, I have to enter the key.
I have found several articles about this and they all pretty much say the same thing. I have decrypted the disk, reset and reinitialized the TPM module and reencrypted the disk and I get the same thing.