Without all the info, can't say for sure. I assume you are pinging the same server in your tests, and that it is located online and that your laptop is on wireless and desktop is wired in?
If so, the simple answer is something is probably wrong with at the physical level. Either NIC (PC or in the router) or network cable. Check to see if the cable is pinched, try swapping out another NIC in the PC, use a different port on the router, try a cable you know is good.
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