This screams "key logger" to me. Have you checked your PC for viruses and scumware - key loggers are rampant (key loggers track every key you type, capture the data and send it out).
I'd have a really good check with an AV ("AVG Free" v7.5 maybe) and get "ZoneAlarm Free" (firewall) installed straight away if you haven't already. ZoneAlarm will prompt you every time something trys to send data out from your PC and you have the option to Allow/Deny temporarily or permanently. Every gambler should have those from Day 1 and take a few minutes to learn how the firewall works - it's easy enough but worth understanding so you know how to block/unblock if you Accept/Deny the wrong thing
Cheers
Simmo!