A: You can disable EFS using a registry hack. You must modify the value of the NtfsDisableEncryption registry key, which is located in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem. To disable EFS you must set the key to value 1. You can accomplish the same thing by using the following from a command line:
fsutil behavior set disableencryption 1
In both cases, you must restart your computer to apply the change. Remember that EFS is only available in Windows 7 Professional, Ultimate, and Enterprise editions and Windows Vista Business, Ultimate, and Enterprise.