Here you can find SNES emulator, some roms, and info on how to get started.
1) Download SNES emulator for Windows, below.
2) Unzip the file to any dir. For eaxample C:\unzipped\snes9x
3) Now you need to download some roms (games taken from Snes
cartriges)SNES
roms
4) Once you've downloaded rom, you need to unzip it into the same directory as you placed your emulator. For example I would unzip my rom to C:\unzipped\snes9x
5) Now you are almost ready to play just go to your dir which in my case is "C:\unzipped\snes9x", there you are going to find file that's name matches to the name of the rom. Now what you have yo do is to click on this file you will see screen saying open with, on a bottom of this screen click others, browse and open it with SNES.exe file which in my case is at C:\unzipped\snes9x. Does it work? No? Then you should do the same things with the file that has similar name (some games come with 2 or more files after unzipping, sometimes)
Good Luck!!!