Hello Adreval,
When your cable modem is connected to the router, and one computer is connected to the router with an ethernet cable, does that computer get internet?
If so, something you can try that might help your wireless adapters is to make sure your router and the wireless adapters are all set to transmit and receive in the same protocol. Like if you have a G router and G wireless adapters, make sure they are all set to G only.
There will be a setting in the router setup that you can set. For the wireless adapters, you need to go to Control Panel, Network Connections, right click on the wireless adapter, properties, configure the wireless adapter, advanced tab, then there should be a setting like transmit mode, 54g mode, or something like that. Set that to G only, or whatever your router is.
Hope that helps!
