|You seem to post an awfully lot of questions & all of them are very difficult to understand. |
The above clarification does little to clear up the original post. Your ASUS is not an issue & shouldn't be mentioned & you posted zero info about the "old desktop running XP".
If your Videotron cable modem only has a single network port, you can only connect one device to it at a time. You cannot use a splitter. If you want to connect multiple devices, you need to use a router. The router will have numerous network ports. If you use a wireless router, it will have numerous network ports plus wireless connectivity.
I'm guessing you only have a modem & don't have a router. If that's the case, just connect a network cable from the modem's network-out port to the network in-port on the "old desktop running XP". Make sure the computer's network port is enabled in the BIOS & that the network drivers are installed. And make sure you're using a network patch cable, not a cross-over cable.
So either your wiring needs to look like this: http://www.downloads.netgear.com/fi...
Or like this: https://cdn.windowsforum.com/attach...
message edited by riider