Network setup

[green777]

I Have a thompson speed touch router and its set up so my pc ethernet gives out 100mbps and the wlan wireless gets 54mpbs, When i download and the wlan pc is not online i get a very good download, as soon as the other laptop using the lan network settings the downloads go down drastically. Is there anyway to reduce the wlan wireless 54mbps ? Also im finding the laptop is being left on over night so as soon as i put my main pc on and boot up the
speedtouch , that connection grabs most of the mbps. Is there a way to disable the lap top without deleting the setup or can i just go to the network run configure and take off a couple of digits from the web key and save it to disable the connection, then put the digits back and re-enable it later.Any help thanks
green777