CPU mining, and even GPU mining isn't worth it these days because of the difficulty and the availability of ASICs. You could mine litecoins with just a GPU setup though.
You're about 3 years too late to mine BTC with a setup like that. This is like you walking into quarry, explosions going on all around you, huge machines big as houses ripping chunks out of the earth everywhere, and you standing in the middle of all that grasping your little brothers neon yellow plastic sand shovel, beaming brightly: "I'm gonna mine too"
Haha, this is true.
Avoid cpu mining. If you want to start with more hashes buy a asic miner. Cheap ones cost less than $20 on Ebay.
I've heard that you'd be better off buying the bitcoins outright rather than buying one of those USB miners.