Thanks again, I do appreciate your help.
Since I do want to eventually put the other PC on a wireless connection, which router do you recommend? Like I said, I never had this type of issue before, so maybe something is wrong with the router. From what I know, routers don't tend to last very long.
Also, the Arris was free from the cable company, so I really can't complain too much.
As for the switch, I would love to, but the other PC isn't mine, and the owner of it wants it out of a certain room. I really don't want to use a 100f cable to wire it either.