I am attempting to encrypt files on a Windows 7 OS using EFS. Receiving an error that states "The File Recovery certificate being outdated or expired is the most frequent cause of this invalid recovery certificate message". I have located this to an expired certificate under RSoP, belonging to an account called sysadmin. The problem is that this laptop was a computer that I was given when I left my previous job. I'm presuming that account belong to the tech support team. It no longer exists under user accounts. I've logged on with the Administrator account and recreated a certificate and generated the DRA, but still receive the same error. The certificate for sysadmin under RSoP still remains.