I know very little about computers. I googled SPICE and the first result that was not food related listed the University of California Berkley. I found a long list for various operating systems. There was a statement that said none of them would work on Windows. So I thought that the DOS list was what I needed.What are you want to use a DOS based spice program?
Several on these forums (myself included) use the free LTspice Windows or Mac program from Linear Technology.
Thank you for illuminating binary and source and for also recommending LTSpice.You are definitely going to want to download a binary for your operating system. If you download the source, then you will have to compile the source code to turn in into an executable program. That's not something you want to mess with at your level of experience.
There are numerous SPICE simulators out there (LTSpice is one of the main ones that is used by a lot of people), some for free and other not. Each of them has its own pros and cons. I second the recommendation to get LTSpice as your starting point. There are several tutorials to help you get started and people here can give you quite a bit of help, too.