1) Is your Wireless Radio turned on? Fn+F2 will cycle through turning the wireless radio and Bluetooth on and off.
2) Does your Wireless.Network Adapter appear when you expand "Network Adapters" in Device Manager? If so, does it indicate it is functioning correctly? What driver is shown as installed when you right-click on it and choose "Properties" from the popup menu?
G74SX-A1 - stock hardware - BIOS 202 - 2nd Monitor VISIO VF551XVT