Your laptop has network devices that are relatively new. I would advice installing 12.10.
Make sure your hardware wireless switch is ON. I have a Toshiba A665 laptop and the keyboard button to enable/disable wireless actually works.
You may need to enable it by software also. Check this tutorial
on how to use 'rfkill' to do that.
Try loading manually the module 'alx', which will be available only on 12.10.
Sources: here, here, and here.
Let us know if you need more help with the process.