There's not much point in using what you have, it's not enough horses to pull the load these days. You might have thermal issues as well depending on your netbook. Use it for a netbook, that's what it was designed to be.

The only point in buying equipment to mine bitcoins is that you find it amusing, at this time it's improbable that you would ever break even on the investment. Once you are mining it's really really boring, there are lots of more amusing things you can buy, golf and hookers come to mind as examples