Fullscreen flicker in SDL

Im making an animation in SDL and VB 2010, but when i toggle fullscreen the screen flickers.

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int main(int argc, char* args[])
{
	SDL_Init(SDL_INIT_EVERYTHING);
	SDL_WM_SetCaption("Acid", NULL);
	ball = IMG_Load("Ball.png");
	back = IMG_Load("syre.png");
	awe = IMG_Load("awesome.png");
	pink = IMG_Load("BallPink.png");
	Uint8 *key;
	key = SDL_GetKeyState( NULL);
	SDL_Event event;
	bool quit = false;
	while (quit == false){
		while( SDL_PollEvent(&event) )
		{
			if(event.type == SDL_QUIT || key[SDLK_ESCAPE])
			{
				SDL_Quit;
				quit = true;
				return 1;
			}
	
      
		}
		screenprint();
}
		


	return 0;
}

void screenprint()
{
	b1dir = getdir(b1x, b1y, b1dir);
	b2dir = getdir(b2x, b2y, b2dir);
	b3dir = getdir(b3x, b3y, b3dir);

	b1x = getx(b1x, b1dir);
	b1y = gety(b1y, b1dir);

	b2x = getx(b2x, b2dir);
	b2y = gety(b2y, b2dir);

	b3x = getx(b3x, b3dir);
	b3y = gety(b3y, b3dir);

	offset1.x = b1x;
	offset1.y = b1y;

	offset2.x = b2x;
	offset2.y = b2y;

	offset3.x = b3x;
	offset3.y = b3y;
		
	buffer = SDL_SetVideoMode(640, 480, 32, SDL_FULLSCREEN );
	SDL_BlitSurface(back, NULL, buffer, NULL);
	SDL_BlitSurface(ball, NULL, buffer, &offset1 );
	SDL_BlitSurface(pink, NULL, buffer, &offset3);
	SDL_BlitSurface(awe, NULL, buffer, &offset2 );
	SDL_Flip(buffer);
	SDL_FreeSurface(buffer);

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