I have upgraded my ram to 2g, my hard drive to a 320g, 7200. I have installed win 7 with the latest drivers from Acer. The unit runs very well and much faster then with XP and the original HHD. The problem I am having is shutting down, it hangs at the blue Logging Off screen and that is it. Every now and then it shuts down as normal, but most times I need to hold down the power button until it does shut down. I have not upgraded the bios to the latest/greatest. Could this be the reason? GT