Windows7 Media stream is not enabled what's going on?

question: My family has two windows 7 computers, one of which is prompted when setting up a homegroup: "Media streaming is disabled by administrator-defined Group Policy", I don't know why this is so, another computer does not have this problem!

　　answer : This should be the case with Third-party optimization software that has unintentionally disabled the Windows Media Player Network sharing service. You can enter service or services.msc in the start → search box, open the Service window, locate Windows Media Player Network Sharing Service, double-click the properties of the service, and set the startup type to Automatic. You can then set up the homegroup by manually enabling the service.