Hello, i would like to know the minimum system requirements to create a game with blender.

It depends on how much eye-candy you want to add to your game. You could create a game using a computer from 1998 if you really wanted to (but I would not recommend it). Basically, anything from 2004+ is capable of playing a game of some level.

Whatever you have. I used to develop games on a 1.2ghz dual core, 1gb ram, integrated (crap) graphics. I couldn’t do GLSL or anything, but still had a lot of fun.
A few months ago I bought a new laptop: 2.6ghz quad core, 8gb ram and a Radeon 7670M, and have yet to hit the performance ceiling.

As long as you are having fun, and have enough time, make games!