I password all my PC's with a strong encryption passphrase (actually have a domain controller set up with roaming profiles so I can log into any PC in my house with the same details). At least 13 characters letters numbers upper and lower case. Something like 0v3rCl0ck3r5rul35 (not that obviously). Passphrases make it easy to remember but quite hard to break. I have the server set to change it once a month for me and all my family, my family have very limited accounts, they cannot install anything and can only save to their own home area. I also have an encrypted drive on my main PC where all my important personal data is stored. I encrypt my pendrives also.