I have a horrible computer for games (integrated graphics card) and it runs great.
That may well be, but my current computer does not meet the minimum requirements in very important ways. It is simply too old. My graphics card not only does not have the minimum 256MB of Video RAM required, but it is also not compatible with DirectX 9c, which is used in Fallout 3. I have had experience with running games below the minimum requirements and sometimes they work OK, but it is not the case this time. On top of that, the computer is suffering from power-supply problems and is on the verge of self-destruction altogether. It switches off randomly and often refuses to start up again - I have tried numerous things to fix it, but it is too late for it - I need a new one - this is now impacting not only games, but more importantly, my ability to do work on the laptop.
Before you ask... as much as I am looking forward to it, I did NOT get a new computer nor decide on the timing of the purchase for the sake of playing Fallout 3!