your computer doesn't have a graphics card?
basicly CPUs are worthless for mining.
graphics cards are ok but slow (assuming your using shit from around the house, and don't really care about power consumption at the current price of 200usd/btc)
fpgas are slightly above graphic card speeds at much lower power. if only i was around 1.5years ago and invested in them then.
asics are the best, with only 1 actual company, and they are sold out, because they are a skeleton crew in china.
we are scrambling to try to find a solution to get an asic device into your home mining ASAP