In order to use the Slingplayer for desktop application, you are required to have Windows 7 or later. I would recommend for you to update your operating system. However, there have been recent changes. Slingplayer for desktop application is only used for reconfiguration. In order to stream your Slingbox, you would need to go through Newwatch.Slingbox.com. Below are some helpful links:
- What operating systems and processors are supported by Slingplayer for Desktop?
- Watch your TV via the web, configure your Slingbox with a computer
Sling Media Support Team