What I did is try to restore my windows to a previous date. It somehow resolved and I try to pull the lan cable out and in again. I do not know if this is enough to really test it. I am not knowledgeable of this things. I am not an IT professional although I act as an IT guy in the office :D
So your saying that restoring to previous date fixed your problem?
Pulling the cable out and plugging it back in to your computer isnt ging to fix the problem if it still persists.
goto the router, unplug your cable to the computer from there, and plug it into another port, if this fixes your connection, its the port. if not, try a different ehternet cable, maybe bad wiring in the one your using. If that doesnt fix your problem, you have eliminated the router as the problem, and the ethernet cable. If everyone else still has connection, and you have tried another ethernet cable that works for someone else, and you still have no internet, its your computer that is the problem and maybe needs some special attention.