The options provided below might help you solve the problem.
Suggestion 1: Restore two registry branches.
Let's repair the following two registry keys:
1. Click "Start", click "Run", type: "Inf" (without quotations) and press "Enter". A folder will open.
2. Locate the file "au.inf", (you can type au to locate the file), right click it and choose "Install".
Note: The file extension ".inf" may be hidden; we may only see the file named "au".
3. The setup process will try to restore the registry branches automatically. However, you may not receive any notification. If some files cannot be located automatically, we will be prompted to select the installation source. Please click "browse", and go to this location:
If this folder is unavailable, please choose the folder "C:\Windows\System32".
4. Please restart the computer.
Now try Update to see if the issue has been resolved.