Re:duplicate post please delete
2012/05/24 10:48:26
(permalink)
First, disable encryption so that no further files will be affected. This entails adding a registry key under HKLM\SYSTEM\CurrentControlSet\Control\FileSystem called NtfsDisableEncryption and setting it to 1. After doing that, the option to encrypt files should be disabled (grayed out) in the File Properties dialog.
Next, log in as Administrator (not as a user with admin privileges) and unencrypt the files/folders. If you still can't do it, they may indeed by corrupt, or the encryption certificates have been lost or corrupted. In that case, you'll have no choice but to delete the files and re-install those products.

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