Hello Mr. PC
We'll probably need to try and see if we can find a little more detail about your wireless card first. Open a terminal window, in Gnome that is from the 'Applications Menu - System Tools', and in it either type what is below, or copy and paste it:
The 'lspci' part of the command lists all pci devices and the '/sbin/' part is the path to the command.
You should see a scrollable list of information on your pci devices.
Look for the ones that mention 'ethernet controller' or 'network controller'. Copy and paste those back and we'll think about the next step.