In case you have a Nero 8 serial (legit serial I mean), you can get Nero 8 Micro (google).
For the free ones, there are, CDBurnerXP, ImgBurn, Burrrn (music only), DeepBurner, Infra Recorder, Burnatonce, etc
In fact, you can install any free ones and I'm sure it will be compatible. It does not mean that a software doesn't have "Compatible with Windows 7" that it is not. If they are compatible Vista, they are with Windows 7.