Walter got a new computer and just updated it to Windows 8.1. But he's thinking of downgrading to Windows 7 because he likes TrueCrypt's whole disk encryption. Leo says that BitLocker is good and it's built into Windows 8.1. Fast and effective. He can get BitLocker through Windows 8.1 professional, but Windows 8.1 automatically encrypts by default, and he'll have to use his Microsoft account to login.