connectivity problem

[refy]

i have a problem. this morning when i tried to plug in the internet cable in my laptop i kept getting that yellow triangle with an exclamation mark on it (down in the right). i kept plug in and out the cable until i got connected. i use a cable/dsl router, having 2 computers connected in the same time. only mine gave this error, as the other ran perfectly in the meantime. what seems to be the problem? a virus/trojan?
please help. i know it can maybe be a noob question, but i am not very good at computers.

[mjc]

If you are physically plugging and unplugging your laptop on a regular basis (like daily), the first thing I would suspect would be a bad cable. They aren't really meant for that kind of activity, they are more or less designed to be a plug in and leave it that way for a while.