Connect for a second then dropped

I just plugged in my laptop to the ethernet here on my Work network. For some reason, it shows that the line is connected on the bottom right, but as soon as it connects, it goes away, shows I'm disconnected, and the wifi icon reappears.

If I unplug the ethernet cord, and plug in again, the same thing happens, it connects and disconnects. I've switched the ethernet cords between my laptop and desktop, and the same thing happens.

Any ideas? This was working perfectly on Saturday when I was using it here..

This is fixed. I just ran windows 7 troubleshooter, got this as an error: None of the networks previously connected are in range - detected

But after that it works, weird.

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