Hello, first of all did you follow all those steps from antihack message? Try to run client wth admin permissions. Right click > Run as administrator. If the problem still occurs, probably the computers of this internet cafe have harmful programms installed on them, chance of viruses and keyloggers is also possible. If you can download a free antivirus and do some tests would be great. Btw Windows XP are not supported by Microsoft anymore. I would not recommend you to play InfinityMU and write down any passwords in browsers from the internet cafe pc's for your own safety.