CADScott said
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For interest, what level of system are you trying to emulate? If it is just the lower end stuff, up to N64 and Playstation, then you should be able to do nearly everything with Retroarch as your emulator, which makes the setup even easier, because you can use the controller for changing all your settings on the fly.
If you are wanting the higher end machines like Gamecube, Wii and PS2 then you will need separate emulators, and a keyboard and mouse to get everything running perfectly, but when it is done you shouldn't need anything but a controller.
Everything through Gamecube, Wii and PS2. I'm hoping my old computer can handle it - I believe I actually tried the PS2 emulator and Dolphin on it years ago and they worked okay. I can always hook up a mouse and keyboard to play with the settings and such but the majority of the time I would just like it to sit next to my TV.
EDIT: Using Windows 7, yes