First, let's verify that the workstation has the latest version of Silverlight installed.  To do this, please go to: https://www.microsoft.com/getsilverlight/Get-Started/Install/Default

If you have the latest version, you will see the message "You are ready to use Silverlight."

If we have the latest version, we'll check to see that Silverlight has been enabled on Internet Explorer.  To do this:

1. Open Internet Explorer, select the Tools button (gear icon)
2. Select Manage add-ons.
3. Under Show, select All add-ons.
4. Locate and select the Microsoft Silverlight add-on
5. Click Enable
6. Select Close