Hi, What graphics card do you have in the computer? I don't know how much you know about mining but if you want to start out easy use GUIMiner
download here:
http://guiminer.org/Easiest way to start is to use Bitminter and use their pool and mining software instead of guiminer
http://bitminter.com/With GUIMiner:
1.Join a mining pool
2. Get the pool connection info
3. Type it into GUIMiner
4. Set parameters
5. Start Mining!
Mining on the CPU you will hardly get anything at all even with free electricity, it would take probably one hundred years very conservatively to get some coins if you are even lucky enough, with the ASICS on the way even using a modern GPU will be much more difficult to be profitable than right now.