Stop mining on CPU, it makes no sense.
Check out https://en.bitcoin.it/wiki/Mining_hardware_comparison
If it is the GeForce G210 you have, then you should be able to get 3.38-3.79 Mhps, which is at least faster than your CPU. If the GPU doesn't show up in the miner then perhaps it is an older GPU that doesn't support OpenCL. G210 vs 210, I don't know Nvidia models well. Either way, Nvidia GPUs are very very slow for making bitcoins, especially the older models.
But have a look at the ASICs at the URL above. Soon all GPUs will be ridiculously slow for making bitcoins. After the ASICs come out it probably won't make sense to mine on anything else.