Mining bitcoin using cudaminer? I have started mining using an nvidia gtx 670m GPU. I have compiled cudaminer and started mining on the slush pool. However, during mining I always get results similar to:

accepted: 0/X (0.00%), xx.xx khash/s (booo)
accepted: 0/X (0.00%), xx.xx khash/s (booo)
accepted: 0/X (0.00%), xx.xx khash/s (booo)


where X is an increasing counter and xx.xx is the hash rate(usually between 75.00 and 100.00 khash/s). Is this related to networking, more specifically port forwarding? I am asking because the bitcoin-qt client managed to synchronize with the network.
That means your results are being rejected. Most probably becouse someone else's found them before. Mining bitcoins at 100KH/s is useless, at 280GH/s 0.06BTC are mined daily so....