BitLocker Drive Encryption Issue

When I go to the control panel and go to BitLocker Drive Encryption then click Turn on BitLocker beside my C:/ drive I get the following message:

This device can't use a Trusted Platform Module. Your administrator must set the "Allow Bitlocker without a compatible TPM" option in the "Require additional authentication at startup" policy for OS volumes.
I don't understand this as I'm the only user on my laptop and I have administrator privileges, so please help!

Come on now I need help with this!

Thanks that did help I got BitLocker to work!

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