Simple Directmedia Layer

I use C++ and SDL to make a 2D Sidescroller Game.
But I have problems with the "Tearing", it looks fucking ugly when move sprites.
I already activated "SDL_DOUBLEBUF" and "SDL_FULLSCREEN".
I also switched "Doublebuffering" on, at my graphics card configs.
I even tried "SDL_SWSURFACE"(software renderer) instead of "SDL_HWSURFACE"(hardware renderer).
And of cource I use SDL_Flip instead of SDL_Update.

What am I doing wrong?

Wow, well that's a bit fucked. What hardware are you using anyway?