To disable Encrypting File System feature on a System, administrators can run the below command from command prompt.
reg add “HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\EFS” /v EfsConfiguration /t REG_DWORD /d 1 /f
This works on Windows XP and Windows 2003. It does not seem to be working on Windows7, looks liks EFS registry keys are changed in Win7.