wireless connection via 2 routers

At present my setup is cable signal->Linksys cable router (BEFSR41) ->3 pcs and this is working satisfactorily. I wanted to add a wireless connection also using the La Fonera wireless router (from renewing my PCA subscription). This route has only one cable output, so I tried inserting it between the Linksys router and a PC.
I now had a L/sys router ->2pcs and also ->La F router which I then connect to the 3rd PC.
When I fire it up the 2 PCs work normally but the 1one connected via the other router does not. Windows offered to repair the connection but could not.
Has anyone any suggestions to make it work?
(Returning to the original configuration still worked)

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