1 Copper

RE: slow internet loading, slow youtube response: Dell 5558

You modem/router probably doesn't have the best antenna. Your wife's MacBook might have a stronger receiver than your Inspiron. I would try to get a new modem/router combo that has a higher range. 

Also, is the Internet slow when you're close to your router or it usually slows down when you're on the other side of your house?