Do you have Windows 10 Home? Then this is how you can encrypt your PC.

[Windows Central]

Are you running Windows 10 Home on your laptop or desktop computer? Then this is how you can protect your files using encryption.
Windows 10 Home doesn't include BitLocker, but you can still protect your files using "device encryption."
Similar to BitLocker, device encryption is a feature designed to protect your data from unauthorized access in the unexpected case that your laptop is lost or stolen. When the feature is enabled, the entire system drive and secondary drives connected to your device, are scrambled, and only you with the correct password can access the data.

Full story from the WindowsCentral blog...