As the two computers are connected to the router, they are already "networked". However, the only folders or printers that are accessible over the network are those which are set as "shared".
Therefore, if there are no folders set as "shared" in the Laptop, there is nothing for the Desktop PC to find. Set the folders in the PC that you want to be accessible from the Laptop as "shared" and you should find them in the Laptop's "Network" (My Network Places).
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