Advanced EFS Data Recovery (or simply AEFSDR) is a program to recover (decrypt) files encrypted on NTFS (EFS) partitions created in Windows 2000 and Windows XP. Files are being decrypted even in a case when the system is not bootable and so you cannot log on, and/or some encryption keys have been tampered. Besides, decryption is possible even when Windows is protected using SYSKEY. AEFSDR effectively (and instantly) decrypts the files protected under Windows XP (including Service Pack 1) and all versions of Windows 2000 (including Service Packs 1, 2, 3 and 4).