The game is totally server based it stores nothing on your computer. If you are having problems accessing it. It will be down to you not logging in correctly. I have been playing the game for years, and have changed laptops from Windows 7, 8, 8.1 and 2 different Windows 10 machines. I have also changed my username 5 times and password many times. and have never had any problems logging into the game on any of them. Over and above that I have also logged into the game on a couple of my husbands laptops when mine have went wrong, and logged in on my sons laptop when we go to visit him. Also from different countries (UK, USA, Portugal, Holland, France) and in 2 different Hospitals in the UK. Have never had any problems as I know the game server I play on and my username and password. The only problem I have encountered has been lag due to the speed of different ISPs.