Sad to hear you have problems with the games. Since they are real-time 3D games, unlike most other games out there (most use 2D with pre-rendered movies, calling it 3D), our games are more demanding of the graphics card than such games. An older PC might have too slow a graphics card. But it may also be that older PC's usually are filled with programs and services that runs in the background, stealing CPU and GPU cycles from important tasks. One of us recently helped his mother clean up her old PC and Esqueleto Explosivo ran twice as fast afterwards. The very first thing you can try though is to manually set the game's graphics settings to Performance (look under the game's main menu and then graphics settings). We hope you can find a way to play and enjoy the games.