Since you asked so nicely....
1) First of all, you need a Nintendo 64
emulator. A emulator is just a special program that mimics how another machine behaves. In this case, a Nintendo 64 emulator is a piece of software that mimics how the Nintendo 64 behaves. That's all you need, you don't need other
programs.
Some good emulators you can use are:
Mupen64
Project64
1964
3) Then you need to place the Rice Video plugin file (its a *.dll file) into the "Plugin" subfolder of the emulator you are using. Also, the plugin's INI file needs to go in the same folder as the plugin file. Any other files with the plugin, go into the main folder of which emulator is used.
Then it gets a little tricky. Depending on the emulator, there is different ways to pick the plugin. Since I do not have all day, I'll just explain how to load the video plugin using Project64:
a) Load up Project64
b) Go to "options"
c) Go to "Settings"
d) Then, select the Rice Video plugin, in the "Video (graphics) plugin" dropdown list.
It really is that simple. From there you can set up input plugins and sound plugins.