Cannot delete certain registry keys and Error while deleting key occurs

This article provides a resolution to solve the Error while deleting key error that occurs when trying to remove certain registry keys.

Original product version:   Windows Server 2012 R2
Original KB number:   2021860


You may get the following error message when trying to delete a registry key:

Error while deleting key


This can be caused if you attempt to delete a registry key that contains embedded null characters. These characters aren't visible when viewing the registry entry.


To delete a registry key that contains an embedded null character, you must first replace the null character with another character. You can accomplish this by using the RegDelNull v1.11 tool from Sysinternals.

More information

Usage: regdelnull <path> [-s]
-s Recurse into subkeys.

It isn't possible to manually create a registry entry with an embedded null character. This usually occurs because of a corrupt application install or similar. It's also possible for the Windows kernel to embed a NULL character in a string to form a complete key name. If this entry is then accessed from user-mode, it isn't possible to open the key containing the embedded null string.