axis and viewport

OpenGL OpenGL: Basic Coding
1

hello .
I have this code that render an axis tern on the bottom left of my screen .
I use a vieport ,I read on a book that for solve the same problem draw the axis on a texture , then render the texture with axes on a quad at the bottom left of the screen .
Why it do this ?
i do this:


GLdouble modelMatrix[16];
GLdouble projectMatrix[16];
GLint viewport[4];

	// save all information
	memcpy(modelMatrix, m_modelMatrix, sizeof m_modelMatrix);
	memcpy(projectMatrix, m_projectMatrix, sizeof m_projectMatrix);
	memcpy(viewport, m_viewport, sizeof m_viewport);
	
	//Imposto la Viewport per gli assi
	
	SetViewportAxes();
	glCallList(m_GLLists.Axes);                           


        //restore the information 
	memcpy(m_modelMatrix, modelMatrix, sizeof modelMatrix);
	memcpy(m_projectMatrix, projectMatrix, sizeof projectMatrix);
	memcpy(m_viewport, viewport, sizeof viewport);

	glLoadIdentity();



void CCMPView::SetViewportAxes(int x, int y)
{
	//Imposta la viewport per la visualizzazione del sistema di riferimento globale
    ::glViewport(x, y, CMP_AXES_VIEWPORT_DIM, CMP_AXES_VIEWPORT_DIM);
#ifdef _DEBUG
	if ( GL_NO_ERROR != ::glGetError() )
		{
		::AfxMessageBox("Error while trying to set viewport.");
		}
#endif
    ::glMatrixMode(GL_PROJECTION);
	// initialize the projection matrix to a pristine state
    ::glLoadIdentity();

    SetupAxesViewingFrustum();

    ::glMatrixMode(GL_MODELVIEW);
    ::glLoadIdentity();
  

}




void CCMPView::SetupAxesViewingFrustum()
{
	//Imposta la modalita di visualizzazione prospettica o ortogonale
	if (m_ViewParams.Par.IsViewFlag(VIEW_PERSPECTIVE))
		// select a default perspective viewing volumn
		gluPerspective (30.,	// Field-of-view angle
				1./*m_AspectRatio*/,	// Aspect ratio of viewing volume
				2.,	// Distance to near clipping plane
				6.);	// Distance to far clipping plane
	else
		glOrtho(-1., 1., -1., 1., 2., 6.);
}

I have some problem with windows 7, and that are related to the viewport (if i remove all the axis viewport code from project it work ,else all the graphics is stereched and rendered in the axis viewport.
I rebuild the above code for this you see some errors?.
thanks