|Look in control panel, is there an exclamation mark beside the wireless adapter?|
If not, go into Network Connections and right click on the wireless NIC. Does it show it as being enabled or disabled? If it's disabled, click on "enable" and see if that doesn't fix it.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.