Examples of registry operations that can bring up this error are merging, importing, or restoring a file in the registry. Many permissions are involved, and it’s possible that (even though you made the backup, for example), you have insufficient permissions to perform the desired operation.
What do I do when I get the registry data writing error?
1. Try again in Safe Mode
Now, the computer boots with no drivers loaded. Attempt the registry operation once more to see if it still throws the not all data was successfully written to the registry error.
2. Change the registry key permissions
Here, we changed the owner of the registry key to allow Administrator users to perform critical tasks on the registry.
3. Perform a repair upgrade on you Windows
These steps solve the not all data was successfully written to the registry error by repair upgrading your system. However, this method reverts your computer to a state with no latest updates installed. To keep your updates and not lose them, make sure that your PC stays connected to the internet in the course of the upgrade. The error that says not all data was successfully written to the registry can pop up on different scenarios. Most users encounter the issue when attempting to merge or import a file into a directory. The general solution is to change the ownership of the file to either yourself or the Administrator. However, before doing that, we recommended that you try performing the registry operation again, but in Safe Mode.
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