Handling resources...?

Hi! I''ve been developing a GUI now for my spare-time-project and have bumped into a problem. My GUI is based upon 10 textured quads with 2 textures each (20 textures a 128*32*24) When I''m changing the resolution with the GUI, the texures disappear and i have to reload all my textures and when I''ve changed the resolution about 7 times (bug-hunting) my whole computer locks up due to low resources. Do I really have to reload all my textures when I''m changing resolution and changing from Fullscreen to Windowed mode? My reinitialize-function

ReInitialize(int new_iWidth, int new_iHeight, int new_iDepth, bool new_bFullscreen, HWND hWnd)
{
	iWidth		= new_iWidth;
	iHeight		= new_iHeight;
	iDepth		= new_iDepth;
	bFullscreen     = new_bFullscreen;
	if(hRenderContext)
	{
		if(0 == (wglMakeCurrent(NULL, NULL)))
			MessageBox(NULL, "wglMakeCurrent Failed", "The Unrevealed", ERROR_STYLE);

		if(0 == (wglDeleteContext(hRenderContext)))
			MessageBox(NULL, "wglDeleteContext Failed", "The Unrevealed", ERROR_STYLE);

		hRenderContext = 0;
	}

	if(hDeviceContext)
	{
		if(0 == (ReleaseDC(hWnd, hDeviceContext)))
			MessageBox(NULL, "ReleaseDC Failed", "The Unrevealed", ERROR_STYLE);

		hDeviceContext = 0;
	}

	if(hWnd)
		hWnd = 0;

	if(!bFullscreen)
	{
		if(ChangeDisplaySettings(NULL, NULL) != DISP_CHANGE_SUCCESSFUL)
			MessageBox(NULL, "ChangeDisplaySettings Failed", "The Unrevealed", ERROR_STYLE);

		SetWindowPos(hWnd, HWND_TOP, GetSystemMetrics(SM_CXSCREEN) / 2 - iWidth / 2, GetSystemMetrics(SM_CYSCREEN) / 2 - iHeight / 2, iWidth, iHeight, SWP_SHOWWINDOW);
	}
	
	if(bFullscreen)
	{
		memset(&dmScreenSettings, 0, sizeof(dmScreenSettings));
		dmScreenSettings.dmSize			= sizeof(dmScreenSettings);
		dmScreenSettings.dmPelsHeight	= iHeight;
		dmScreenSettings.dmPelsWidth	= iWidth;
		dmScreenSettings.dmBitsPerPel	= iDepth;
		dmScreenSettings.dmFields		= DM_PELSHEIGHT | DM_PELSWIDTH | DM_BITSPERPEL;

		if(ChangeDisplaySettings(&dmScreenSettings, CDS_FULLSCREEN) != DISP_CHANGE_SUCCESSFUL)
			MessageBox(NULL, "ChangeDisplaySettings Failed", "The Unrevealed", MB_OK);

		SetWindowPos(hWnd, HWND_TOP, 0, 0, iWidth, iHeight, SWP_SHOWWINDOW);
	}

	memset(&pfPixelFormatDescriptor, 0, sizeof(pfPixelFormatDescriptor));
	pfPixelFormatDescriptor.nSize		= sizeof(pfPixelFormatDescriptor);
	pfPixelFormatDescriptor.nVersion	= 1;
	pfPixelFormatDescriptor.dwFlags		= PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
	pfPixelFormatDescriptor.iPixelType	= PFD_TYPE_RGBA;
	pfPixelFormatDescriptor.cColorBits	= iDepth;
	pfPixelFormatDescriptor.cDepthBits	= 16;
	pfPixelFormatDescriptor.iLayerType	= PFD_MAIN_PLANE;

	if(0 == (hDeviceContext = GetDC(hWnd)))
		MessageBox(NULL, "GetDC Failed", "The Unrevealed", ERROR_STYLE);

	if(0 == (iPixelFormat = ChoosePixelFormat(hDeviceContext, &pfPixelFormatDescriptor)))
		MessageBox(NULL, "ChoosePixelFormat Failed", "The Unrevealed", ERROR_STYLE);

	if(0 == (SetPixelFormat(hDeviceContext, iPixelFormat, &pfPixelFormatDescriptor)))
		MessageBox(NULL, "SetPixelFormat Failed", "The Unrevealed", ERROR_STYLE);

	if(0 == (hRenderContext = wglCreateContext(hDeviceContext)))
		MessageBox(NULL, "wglCreateContext Failed", "The Unrevealed", ERROR_STYLE);

	if(0 == (wglMakeCurrent(hDeviceContext, hRenderContext)))
		MessageBox(NULL, "wglMakeCurrent Failed", "The Unrevealed", ERROR_STYLE);

	glViewport(0, 0, iWidth, iHeight);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(45.0f, (float)iWidth / (float)iHeight, 0.1f, 100.0f);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();

	glShadeModel(GL_SMOOTH);
	glClearColor(0.0f, 0.0f, 0.0f, 0.5f);
	glClearDepth(1.0f);
	glAlphaFunc(GL_GREATER, 0.1f);
	glDepthFunc(GL_LEQUAL);
	glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
	
	UpdateWindow(hWnd);
}