DirectX:DirectDraw

From GPWiki

DirectDraw is a 2D API, much like SDL. It never made it past version 7 of the DirectX interfaces, but it runs on all versions of Windows. You can define the current DirectX version to be 7 to compile DirectDraw programs using a later Windows SDK (such as the one included with Visual Studio .NET).

Note: Microsoft has planned to discontinue support for DirectDraw and any programmers looking to learn directx graphics would be advised to learn Direct3D (which can also be used to create 2D games)