Ramy,
Check this website http://support.toshiba.com/drivers, I couldn't find your model 11p check on the base of your laptop it should say.
If this doesn't solve your driver issue, right click on computer -> manage -> on the left menu click "Device Manager" -> Network Adapters, check what devices are listed there. Usually Windows 7 auto-detects and installs wireless driver all by itself when Windows is installed so this shouldn't be happening in the first place.
Let me know what happens to further assist you.