Are you using the same cable to connect the laptop as the desktop? If so, are you also disabling the wireless on the laptop?
If it's the exact same connection then the problem must be on the computer.
I would make sure the network card on the desktop is set to 100 and full duplex; if it's half duplex it will not send and receive at the same time; it will wait for traffic.
Other than that you likely have something slowing down the desktop. Which is why I rebuild my own PC every 6-12 months.
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