Sweex "wireless adsl modem/router" No connection between computers

Hi,



I've a -Sweex "wireless adsl modem/router"-



One computer (A) connected wish wire to the router

One computer (B) connected wish wireless



With both I can connect to the internet and it works fine



But I cannot seen computer A with computer B



I cannot reed the files from computer A with computer B and the other way
rond



If I connect both computers (wired) with a another switch than is all OK



What must I change in the:



Sweex "wireless adsl modem/router"



John Dekker

The Netherlands