Internet keeps dropping but my Wife's works fine

[Terex4]

We're hooked up to the same modem via router. We're connected through cables and this system has worked for a long time. This past week, my connection keeps dropping with the problem becoming worse as time goes by.

I've ran Malwarebytes, installed windows updates, and turning my computer on seems to make it worse each time. I checked my cable, its hooked up properly and my dog didn't chew it so I'm at a complete loss. The only thing I can figure is that its an issue inside my computer.

Windows can diagnose and repair, but this usually takes at least two tries and has been as many as four before the net comes back up.

[Nikose Tyris]

Are you using a Network card, or Mobo-ethernet?

[Terex4]

Ethernet cables, I don't know what's inside the machine itself.

Edit: I've discovered that my connection is solid until I open a browser. I've tested this with Seamonkey and Firefox so far. If I'm playing an MMO I don't have any trouble.