Dell Inspiron N5110 - Network Controller Adapter - Driver Problems - New Installation of Win7?

Hi everyone.

I have a problem with the Network Controller Adapter of my Dell Inspiron N5110, which was delievered today (Win 7 64bit).

I deleted the "intel wireless network bla bla..." by accident and wanted to set it up again with the help of the driver cd delievered with the laptop.

The installation worked without a problem, but i can't establish a wireless network connection to the internet. It says, that there ist no network card adapter. So it seems like the driver can't really "touch" the hardware.

Is this a known issue and does a solution exist out there?

Otherwise, I'd like to reinstall Windows 7, which leads to a new problem: There is no installation cd of Windows7, nor can't i find a product key. Where can i find those? Or is there another method?

Please excuse me for my english ;)

Thank you for your help!