I rebooted. Logged in, and there's some notification asking me to backup the key because it is encrypting my file system. I didn't ask it to do that, and I wasn't even logged in as admin before the ...

Microsoft’s Encrypting File System, which is used to encrypt data on Windows 2000, XP and Server 2003 computers, relies on a public key certificate. If you don’t have a public-key infrastructure, EFS ...