I'm not on a Vista machine at the moment, but you should be able to find the "System Information" by click on Start-Programs-Accessories-System Tools-System Information.
And if you want a free third party tool to provide such info, "Belarc Advisor" will do the same thing.
Hope this helps.
I used to know, but I have forgotten. I remember the file gives a GARGANTUAN amount of info (most of which is normally not important.) I would like to know this because presently I can only find basic info on my system.