If I'm reading your question as you intended
You can not access the Wired Computers from the Wireless Computers or Vice Versa.
If I understand your Hardware Correctly and the Network Topology you have a Cable Modem feeding a Switch/Hub which has computers connected to it through Network Cabling, then you have a Cable running to a Router for a WiFi Access Point.
The Wired and WiFi Computers can connect to the Net perfectly well but not with each other right?
If that's correct you need to enter the WiFi Routers Setup and Turn off the Router part of the device. What you have effectively done by using a Router instead of a WiFi Access Point is to create a Child Branch of the Network which is Isolated through the Router from the rest of the Network.
Of course you could also replace the Router with a WiFi Access Point and get the same effect if you have problems in the Routers Setup Section. 
Col
Accessing network computers on different routers
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