Error Result = 0x87d00668 in Updatesdeployment log

Problem:  Error Result = 0x87d00668 in Updatesdeployment log during patches installation

Solution: 

1. Stop the Windows Update service.
2. Rename C:\Windows\SoftwareDistribution to SofwareDistribution.old
   
3. Rename C:\Windows\System32\GroupPolicy\Machine\registry.pol to registry.pol.old
   
4. Restart Windows Update service.
5. Run the Updates Scan cycle 2-3 times till successful.
6. Run the Updates Evaluation cycle, patches will install
   

Error in ClientIDManagerStartup log: RegTask: Failed to get certificate. Error: 0x80004005

The SCCM Client is not working and shows like this:





The above error is logged in ClientidmanagerStartup log.

Solution:

There is a folder: C:\ProgrammData\Microsoft\Crypto\RSA   (on Windows10).
On the MachineKeys folder, check the Security permissions and fix it if required.
Then restart the ccmexec service.