when it will treat the use game, click because you put enter and you will see warning and in disconnect seconds and only want to click your character really that is was the problem
If it was caused because of antivirus the game would quit by the moment u clicked connect.
U should check ur connection but if it kicks u out of game without text " you have been disconnected from the server" then its not because of ur net.smth wrong with mu.try to reinstal it maybe it will help
You might have selected your character by clicking the enter button, please avoid that and choose them with your mouse with double click, or with "select" on your screen.
You must not use your keyboard button "enter" while selecting your character in game. You must double click over your character or just hit the button Connect. If you use Enter <--- button when selecting your character you will receive warning message on the center of your game and if you noticed it what's written in there you will follow it and successfully enter ingame without problems.
Check the wire connected from your PC to the modem if it looses contact it happened to me recently.If nothing helped from all these , lastly for me update drivers, u never know.