Hi,
A list of the failing to install updates would be nice
If too many to list just reset the update system
Try using this to reset the update system it's very good,
Use Option 2 on the list after right clicking it and select run as administrator
https://gallery.technet.microsoft.co...Agent-d824badc
Download it to your downloads folder
Right click it and select Extract all to the downloads folder.
Then right click ResetWUEng and select run as administrator
Follow the rest of the prompts
Press any key to continue
Type 2 for that Option on the list and the Enter key to reset update services..
Press y for Yes and then the Enter key I believe twice
After it has completed
Type 15 for that option and the Enter key to restart the machine.
Should say will restart in 60 seconds save your work.... press any key to continue.
After restart go to windows updates and manually check for updates shouldn't take a few minutes.