-Nintendo 64 Emulation Guide
Project 64 emulation will be discussed here since it is the best one around.
Actually its pretty easy to use Project 64. Dont get scared because of all that plugins.

Okay, Basics first:

-Requirements:
Minimum:
Intel Pentium 3 700Mhz or AMD Athlon 800Mhz CPU
128MB system RAM
100% Microsoft DirectX 7 compatible video, sound and input devices
Microsoft Windows 98
Microsoft DirectX 7 (default plugins), DirectX 8 (all included plugins)

-Recommended:
Intel Pentium 3 1.2Ghz or higher or AMD Athlon 1.2 GHz or higher
256MB RAM or more
nVidia GeForce3 or later or ATI Radeon or later
Creative Soundblaster Live! or higher
Wishtech Adaptoid and original Nintendo N64 controller for each player(mmmm tastey!)
Microsoft Windows 2000/XP