|Are you positive that you have File and Print Sharing installed as a service in the properties of your wireless adapter? |
If you do, I would try to access one of the wired PCs from the laptop via IP address. For example, if the IP address of wired-PC-#1 is 192.168.1.250, on the laptop computer click Start, Run, and type \\192.168.1.250 followed by the enter key.
Reverse the situation when trying to access the laptop shares. If the IP address of the laptop is 192.168.1.5, from any of the wired PCs, do Start, Run, and type \\192.168.1.5 followed by the enter key.
Try these suggestions and post back.