Slow Wireless

I have two Laptops an Acer & Fujitsu siemens both use an atheros network
adapterto connect wirelessly to my Belkin router. The laptops are similar in
spec however the acer connects to my Belkin router with excellent speed
(streaming content perfectly), my fujitsu connects but is extremely slow
(Streaming is unwatchable). The connection strength is excellent on both
machines. Both laptops are in the same room. I have spoken to Fujitsu who
state there is no problem with the network adapter as the signal strength is
excellent, it must be a software conflict. Can anyone help with improving my
connection speed.