Practical advice needed: What do I do now?

[Doug Drown]

I just set up my old computer in the house where I'm newly residing, and the noise interference on AM is awful. FM is fine. 

I didn't have this problem at all with the computer I had borrowed for the past several months. II gather what I need is some kind of suppressor, but I have no idea what. When it comes to computers, I can write, send, save, upload, download, maneuver around the Internet, and create a website (kinda-sorta), but when it comes to the tech ends of things I'm pretty ignorant. 

-Doug