I'm looking to set up a wireless network in my home. The laptop has a wireless card and is ready to go. Bought a router, but couldn't hook it up because all the connections on the back were by ethernet cable. Here is the problem- I have an older Dell PC that does not have a ethernet card in it but is hooked up to my DSL modem with USB. Do I have to buy an ethernet card for the PC or there any adapters or a different router I can use?