Search:

Google, "CIDR" Classless Interdomain Routing. Good luck

Reflash your router with 3rd party firmware, screw Linksys since they won't help you. If your router is supported. http://www.dd-wrt.com Once you do that you void your warranty, if all else fails...

As far as study material I would recommend Test Out or Transcender, good luck

If you just want to connect your xbox to your laptop without any network connections you could just use a cross over cable. Your options: Hub, Router, or a cross over cable.
Obviously the cross...

You need to explain yourself better

Verify that it only happens in your web browser. Sounds like your monitor positioning settings.

Try replacing your video card with another from another machine. Always replace known good with possible bad until you find your problem.