'Microsoft .NET Framework 3.5 Service Pack 1 and .NET Framework 3.5 Family Updates (KB951847) x86'. I've tried multiple times to get the update to install, but every time I just get to 99% and it says 'Code 490 Windows Update encountered an unknown error.'
You might have received this error message when you are using the Windows Updates. Actually, error code 490 could make your compute run slow. You would probably experienced programs crashes, system freezes or even blue screen of death.
We strongly suggest that you run a quick scan for error code 490 for your PC to check and fix the errors.
Error Code 490 indicates a corrupt registry. If something goes wrong with the registry, you would receive error messages during startup or shutdown. And you might get a corrupt program or application. The error also shows up when there is something wrong with the hard ware of your computer.
If you do not take immediate procedure to repair error code 490, your compute would experience further damages. It will hinder the performance of your operating system, bothering you with the constantly popping of error messages, or even result in a malfunctioned hard ware.
Therefore, corrective steps must be adopted to fix the error, and prevent your compute from further corruptions.
As what is showed in the message, you receive error code 490 because something is not running properly associated to the .NET Framework. So the best thing for to do is to repair the .NET Framework in your PC. To do this, you could see the instructions below: