I''ve made a simple application using direct3d but the problem is everytime I run it and then close the application my computer suddenly went idle (mouse movement becomes slow...and all kind of stuff). I''m using tnt2 riva 32 mb. could it possinly my graphic card that cause the problem or just my code? here''s my code #include <windows.h> #include <d3d8.h> #pragma comment(lib,"d3d8.lib") #pragma comment(lib,"dxguid.lib") IDirect3D8 *g_pD3D; IDirect3DDevice8 *g_pD3DDevice; WNDCLASSEX g_wndclassex; HWND g_hWnd; void init(void); void draw(void); void cleanup(void); LRESULT CALLBACK WndProc(HWND hWn,UINT Msg,WPARAM wParam,LPARAM lParam); int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nShowCmd) { MSG Msg; ZeroMemory(&g_wndclassex,sizeof(WNDCLASSEX)); g_wndclassex.cbSize = sizeof(WNDCLASSEX); g_wndclassex.hbrBackground = (HBRUSH) GetStockObject(BLACK_BRUSH); g_wndclassex.hInstance = hInstance; g_wndclassex.lpfnWndProc = WndProc; g_wndclassex.lpszClassName = "direct3d"; g_wndclassex.style = CS_HREDRAW | CS_VREDRAW; RegisterClassEx(&g_wndclassex); g_hWnd = CreateWindowEx(NULL,"direct3d","RZ''s first D3D application",WS_OVERLAPPEDWINDOW,0,0,500,400,NULL,NULL,hInstance,NULL); init(); ShowWindow(g_hWnd,SW_SHOW); while(1) { while(PeekMessage(&Msg,g_hWnd,0,0,PM_REMOVE)) { TranslateMessage(&Msg); DispatchMessage(&Msg); } if(Msg.message == WM_QUIT) break; draw(); } cleanup(); return 1; } LRESULT CALLBACK WndProc(HWND hWnd,UINT Msg,WPARAM wParam,LPARAM lParam) { switch(Msg) { case WM_CREATE : break; case WM_DESTROY : PostQuitMessage(0); break; } return DefWindowProc(hWnd,Msg,wParam,lParam); } void init(void) { g_pD3D = Direct3DCreate8(D3D_SDK_VERSION); D3DDISPLAYMODE d3ddm; g_pD3D->GetAdapterDisplayMode(D3DADAPTER_DEFAULT, &d3ddm); D3DPRESENT_PARAMETERS d3dpp; ZeroMemory(&d3dpp,sizeof(D3DPRESENT_PARAMETERS)); d3dpp.Windowed = TRUE; d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD; d3dpp.BackBufferFormat = d3ddm.Format; g_pD3D->CreateDevice(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,g_hWnd, D3DCREATE_SOFTWARE_VERTEXPROCESSING,&d3dpp,&g_pD3DDevice); } void draw(void) { static int rgb[3] = {0}; static int i = 0; static int inc = 1; g_pD3DDevice->Clear(0,NULL,D3DCLEAR_TARGET,D3DCOLOR_XRGB(rgb[0],rgb[1],rgb[2]),1.0f,0); g_pD3DDevice->BeginScene(); g_pD3DDevice->EndScene(); g_pD3DDevice->Present(NULL,NULL,NULL,NULL); if( (rgb < 0 && inc == -1) || (rgb > 255 && inc == 1)) { if(i == 0 || i == 2) { inc=-inc; } else { i+=inc; } } rgb+=inc; } void cleanup(void) { g_pD3DDevice->Release(); g_pD3D->Release(); } </i>