Wireless adapter disappeared from device manager

Greetings,

I have a Dell XPS L502X, and it was working fine, with wireless connection.

Today, I turned it on and I received a message from Intel wireless that "No physical adapter was found".

I use Windows 7 Ultimate.

I tried ipconfig -all and no wireless adapter was listed.

I tried to press the wireless antennae key, but it did nothing.

So, please, can somebody help me?

Thanks in advance!