Computer causing internet to drop

I have very basic knowledge of networking so keep that in mind (But don't hate learning new things). But whenever I go on my computer while it's connected to the internet it seems to make the internet for the entire house unstable wireless or wired. Please respond and I'll try to get answers to any questions.

Same thing happens on my laptop, and I have to wait for the router to reboot for it to work, so I'd like to see an answer to this as well!