Error on Enter World

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Then the program exits promptly. I was playing just fine about 12 hours prior. All characters do this as well.

I don't know if this will help but;

I played fine with all my chars until this evening. Suddenly GW was a hell; total lag all over the place. I could connect to Arenanet just fine, with over 400kb/sec speeds.

But after the logging in it was a total disaster. As soon as I entered any place, a few seconds after everything freezed. Even the chat was not working, or it took ages to appear. It seemed my connection speed was totally smashed to pieces.

I played fine before, so I guessed reinstalling would solve the problem, it didn't. Then I changed modems and suddenly the problem was solved, very weired. Then I entered the modem set-up of my main modem and saw that my fix IP number was unchecked. I checked it and started GW, all worked fine again.

I don't know why all of a sudden this ruined the gameplay but fixing the IP certainly helped, I played all night without any problems, hope this will do the same for you.

Try to un-install Guildwars, and then re-install it.

Also check to see what your connection / internet settings are suppose to be (DarkerHelmet's issue) and very good thing to check.