Windows File Sharing between WLAN and LAN, D-Link DSL-2740B

Do you have internet access from each of your machines through your router? (This question is just to establish that you have basic connectivity working, and the network adapters working in each computer).

Have you run the home network setup wizard on each machine? (This is the easiest way to set up a home workgroup so you can then proceed to share folders and printers, etc.)

If the answers to both of the above is "yes", then go to My Computer - Properties - Computer Name (assuming Win XP) and make sure the Workgroup name listed is identical for all machines you want to participate in the folder / printer sharing.

Next go to the computer that contains the folders / has the printer attached and enable sharing.

For folders, right-click on the folder, go to properties, and then sharing.

For printers, go to Control Panel, printers, Properties, sharing.