Firstly, don't pay for mining software, there's plenty of good, free options available:

https://en.bitcoin.it/wiki/Category:Miners

Personally, I use cgminer.

Secondly, even if you do swap to an ATI GPU as suggested, I'd think hard about whether to mine at all on a laptop. Unless it has some excellent cooling, heat will be a major issue. If this is your primary PC, think hard about what that might do to the expected lifespan of the laptop vs the likely reward (pretty small for a single GPU at the current difficulty).

If you do end up doing it anyway, I'd probably run it without the battery while you're mining as it will only hurt your energy efficiency, and the extra heat will degrade it more quickly.