The first attempt did not successfully delete the registry key, that error message in Windows Update means 'access denied'.
Let's take it one step at a time and first try deleting the key manually.
Please let me know if you get stuck on any step or have any errors while attempting this procedure.
Manually Delete Registry Key
1. Click your
Start button and type
regedit in the search box.
2.
Right-click on
regedit.exe that comes up in the search results and select
Run as administrator. Answer
Yes to the UAC prompt.
3. The registry editor will open which is a window divided vertically into two panes. Make sure you scroll all the way to the
top of the screen and click any black downward pointing arrows so that they turn white and all the keys are collapsed. It should look similar to the following.
View attachment 14229
4. Now click the arrow next to
HKEY_LOCAL_MACHINE and it will expand all the subkeys beneath it.
5. Scroll down and find the subkey named
SOFTWARE and expand that. Continue expanding the following ones
Microsoft\Windows\CurrentVersion\Component Based Servicing
6. Beneath Component Based Servicing you should see a key named
ApplicabilityEvaluationCache
7.
Right-click on the key named
ApplicabilityEvaluationCache and select
Permissions...
8. On the Permissions dialog click the
Advanced button.
9. Click the
Owner tab on the Advanced Security Settings dialog.
10. Click the
Other users or groups... button
11. Type
Everyone in the text box and click
OK.
12. Check the box "
Replace owner on subcontainers and objects".
13. Click the
Permissions tab again and
uncheck "
Include inheritable permissions from this object's parent".
14. If prompted with a Windows Security warning with Add and Remove buttons, click
Add.
15. Click
OK to close the Advanced Security Settings dialog.
16. Make sure the
Everyone group is selected in the Permissions dialog and ensure that the checkbox for
Full Control under the
Allow column is checked. Click
OK.
17. Now,
right click on the
ApplicabilityEvaluationCache key and select
Delete. Answer
Yes to the confirm dialog.