I have seen PC's working for example with Windows 7, 2GB of RAM, an Intel Celeron of 1.49GHz, without locking or hanging, working without problems while one of my laptops, with 2GB of RAM and an Intel T5250 (Dual-Core 1.50GHz) that it came from the factory with Windows Vista is super slow, the videos hang every moment, etc ... Isn't it supposed that if Vista is the factory system it shouldn't work "moderately" well? Try doing a low-level formatting and reinstalling your original Vista and the performance is exactly the same, with up-to-date drivers. The other day I reformatted it and installed Windows XP, and now it works much better, the videos don't hang at all, but nevertheless I don't notice any fluency in the system, for example if I click on Start it takes a little bit to open, when I open the browser (whatever it is) the computer freezes first, and then manages to move it. I ask this because I am a bit of a novice on the subject and it strikes me to see computers with the same or even scarcer resources than mine working much better. What is the cause? Thanks!