My dad mistakenly bought a regular ethernet cable to connect our two computers together when what we needed was a crossover cable. Now, we don't want to rip the cable out of the wall so tell me, do male/female adapter switches exist that will cross over the wire so that we can buy a male/female adapter and plug another regular wire to the end of it and plug THAT into the back of the computer? We don't want to have to buy a hub...