I've just upgraded my ram, and when I now run vista it (with only the new module in) vista boots up fine, and you can log on, and if you go into task manager you can see that it recognises the new RAM, however, about 20 secconds later, it blue screens, if I boot up in Safe Mode, it works fine, and I can throw anything at it (in terms of apps) I have my computer set up in a dual boot configuration ...