If you Use EFS, There's a way to backup your Key to decrypt data BEFORE you format ur windows client. You can go thru Internet Explorer, Tool, Options, Content, certificates, and then export. After formating your client, just import the certificat using the same method. WATCH OUT ! ATTENTION ! CAUTION ! :: After importing the certificat, it will allow you to decrypt only the previously encrypted data, IF YOU EDIT PREVIOUSLY ENCRYPTED DATE WITH YOUR NEW WINDOWS... IT WILL RÉ-ENCRYPT FROM A NEW CERTIFICAT.