I looked at a link given back in April and I went to the system requirements page but it does not answer one question. What size processor/graphics card do I need? I have a Windows Vista HP and when I start up Unity it shuts down with no reason given.
The system requirements page (http://unity3d.com/unity/system-requirements.html) does tell you what graphics card you need. It’s the second bullet point from the top. There are no CPU requirements other than those needed to run the stated operating systems.