DirectX in system got this error message

Hello,
Recently, I downloaded latest version of DirectX in my system but I got this following error message whenever I try to play any game. I need this application to play games properly so provide a solution to fix this problem.
I would be grateful to you.
DirectX Error
DirectX function “device-> CreateTexture2D (&texDesc,desc.subResourceCount!=0? Reinterpret_cast<const D3D11_SUBRESOURCE_DATA*>(desc.subResourcedata): 0, &texture-> m_texture2d”failed with E_OUTOFMEMORY: Ran out of memory. GPU: "AMD Radeon HD 6900 Series", Driver: 11.10 (8.901.2-111016a-126966E-ATI). Free virtual memory: 2761092kB / 4194176kB. Total resource memory: 0kB. Make sure you have a supported graphics card with at least 512 MB.
