It is not a virus but the notification you are receiving may indicate you have or had a infection of some sort that corrupted it. Silverlight is a Microsoft product that allows you to view video on certain websites much like Adobe Flash Player is required to watch most video online. The major risk, of course, is that security vulnerabilities will no longer be addressed and could leave Silverlight based applications open to significant risk of breach. Once support ends patches and updates will no longer be released by Microsoft. Its what you call a Rich Internet Application, similar to Adobe Flash. I believe the last Olympics which MSNBC had exclusive rights to stream on the web, required Silverlight. Its not a requirement to have it installed, but as noted, some web pages utilize it for streaming multimedia content. Silverlight is Microsoft’s web extension, like Flash or HTML5. Is it safe to download Microsoft Silverlight? 26 Why is Microsoft Silverlight not working?.25 Does Silverlight work in Chrome 2021?.
7 What is Microsoft Silverlight good for?.6 What does Silverlight do to your computer?.5 Does anyone use Microsoft Silverlight?.
1 Is it safe to download Microsoft Silverlight?.