keep hold of FN, bottom of keyboard, just left of your spacebar,, Then press F8 or associated wireless button on your system. Press both buttons together and release together. If no luck it may be your wireless driver needs updating. Try FN first and let me know if that works. If not log onto emachines website
http://support.gateway.com/us/en/emac/product/default.aspx?tab=2 and select your appropiate netbook. After selecting your product, browse through the list of drivers, until you find the appropiate wireless driver. Download and install.
Option 2 is to click on start and type driver in the search bar. At the top of the list you should have update device drivers. Click that and then double click network adaptors, right click listed drivers one at a time and select update driver for each listed.
Hope this helps and please rate,,,