I would check the drivers on the desktop. Also - have you tried swapping cables (to eliminate all issues, unplug it from the laptop, plug it into the PC - don't switch the router port). It should run at close to the same speeds.
I would check the drivers on the desktop. Also - have you tried swapping cables (to eliminate all issues, unplug it from the laptop, plug it into the PC - don't switch the router port). It should run at close to the same speeds.