more of a hardware problem and/or software corruption (ala spyware/virus), then a networking issue. Check for bugs and a stressed out(overheated) CPU.
Everytime I start downloading something from the internet, or start playing a video game, my computer would lose its wireless connection. Sometimes it would even go to a black screen and my monitor would lose its connection with my computer.
Can anyone help me?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic