Step one:

Download the emulator

SmyGb

Step two:

Unzip the emulator to c:\gameboy

for specific instructions click here

Step three:

Download Games

I will provide these few games as long as no one cry's "infringement".

Download games more from http://www.emuhq.com
(you have to look for them)

Step four:

Unzip your games to c:\gameboy

for specific instructions click here

Step five:

go to the folder named: c:\gameboy and double click smygb.exe

Step six:

Select the game from the list choose the game you wish to play, and double click it.

Enjoy!