Desktop not working Windows 8.1

[EverNife]

Hello. I am a Brasilian user who is having a problem in:

Desktop video is not working, i saw other topic with the same subject, but he had no answer.

I need help, how can i fix this? It is saying that i need put in Aero Mod, but, there is no Aero mod in WIN 8.1

Please, i really need help