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The anti-virus program or the Windows installer service might be blocking the installation. I would suggest you to try the following methods and check if it works for you.
Method 1:
Try the steps provided in the following Microsoft MSDN article and check if it helps. This article will help you manually cleanup broken Silverlight installation.
How to manually clean up a broken Silverlight installation:
Try the following steps to start the Windows Installer Service and check.
Follow the steps to start the Windows Installer Service:
a.Press
Windows + R keys and type Services.msc
and hit Enter.
b.Double-click
Windows Installer.
c.Set the Startup type of Windows Installer to
Manual.
d.Click
Start to start the service. Note down the error message if any.
e.Click
OK.
Method 3:
Disable security software temporarily and check if the issue persists.
Disclaimer: Antivirus software can help protect your computer against viruses and other security threats. In most cases, you should not disable your antivirus software. If you do have to temporarily disable it to install other software,
you should re-enable it as soon as you're done. If you are connected to the Internet or a network during the time your antivirus software is disabled, your computer is vulnerable to attacks.
If the methods provided did not help, then I would suggest you to post the query on Silverlight forums and check.