HP Pavilion complains about Bitlocker saying TPM is not found. Is there a setting that I need to enable in the motherboard or is there an update for it?
It's possible to encrypt your OS drive with BitLocker, but if your system does not have a built-in TPM, the only other options are to use a BitLocker Recovery Password (a 48-digit number you type at every boot) or a BitLocker Recovery Key (a 256-bit stored on a USB disk that must be inserted at every boot).
By default, group policy requires a TPM on the system for BitLocker to be enabled on the OS drive, which is why you're seeing this error. To change this policy:
From there, you should be able to enable BitLocker on your OS drive as normal. You may need to logoff/logon for the policy change to take effect.