anchor - 2013-10-02

With few ATI/AMD video card, i get this error: "WGL:failed to find a suitable pixel format"
Sometimes with the latest driver i can fix it, but im curious, why this happen.
example cards from dxdiag files:
ATI Radeon HD 3600 Series
ATI Radeon HD 4600 Series
ATI Radeon HD 5700 Series
Maybe the default driver made by microsoft?
And what is missing from microsoft opengl implementation?
Can you somebody explain?