My Unity is buggy after 5.6.0 update

I was using Unity 5.3.8 at a time when I decided to upgrade to the new version 5.6.0 however I had some problems with this version, first the "Outline" function did not work and it caused errors in the console so I just turned it off, the Skybox Shader/Procedural is completely pink, but that did not bother me much, since I'm currently using Mobile/Skybox, besides I'm seeing several error messages on my console every time I open Unity. I hope someone can help me, the message below shows this error when Unity starting, I just installed the new version, and the errors appeared even after creating a new project, my PC is Windows 10 Shader Model 2.0

Could not find video decoder shader pass YCbCr_TO_RGB1 in shader Hidden/VideoDecode

Could not find video decoder shader pass YCbCrA_TO_RGBAFull in shader Hidden/VideoDecode

Could not find video decoder shader pass YCbCrA_TO_RGBA in shader Hidden/VideoDecode

Could not find video decoder shader pass Flip_RGBA_To_RGBA in shader Hidden/VideoDecode

Could not find video decoder shader pass Flip_RGBASplit_To_RGBA in shader Hidden/VideoDecode

Could not find video decoder shader pass Flip_SemiPlanarYCbCr_To_RGB1 in shader Hidden/VideoDecode

Could not find video decoder shader pass Flip_SemiPlanarYCbCrA_To_RGBA in shader Hidden/VideoDecode

Could not find video decoder shader pass Composite_RGBA_TO_RGBA in shader Hidden/VideoDecode