To answer all of your questions:
I ran the prerequisite installer several times, and still nothing. As far as I understand, running the installer also means installing Microsoft Visual C++ 2010 prerequisite x86. For some reason, I can't find that anywhere in my files, even though I KNOW I have it.
I have never ran a Playstation emulator before, so I'm pretty inexperienced there. For now, I'm trying to run Symphony of the Night, but this error keeps coming up:
"Unhandled exception has occurred in a component in your application. If you Continue, the application will ignore this error and attempt to continue.
The execution has failed due to the bug in the SevenZipSharp. Please report about it to
http://sevenzipsharp.codeplex.com/WorkItem/List.aspx post the release number and attach the archive."
To be honest though, I haven't done much research on how to work the Playstation emulator core, so I would like to ignore that and focus on the N64 for now.
Finally, I've tried all cores for the N64, still nothing.