Keep in mind that you've probably had a keylogger on your computer for quite some time (it normally takes the hackers a good while before they steal your account). The most important thing right now is getting your computer clean and
calling via phone all the companies associated with your online banking/credit cards etcetera and getting your email address/logins/passwords with those companies changed. Remember that everything you use online that has a login or a password has been compromised. It's not just your wow account. Every second that you stay connected to the net with a keylogger on your system, your identity and personal information is at risk.
I recommend a complete format to ensure your system is completely clean. But that's just my personal opinion.
[Important] Key-Loggers and Computer Security:
http://forums.worldofwarcraft.com/th...78038509&sid=1
Account Compromise Info Center:
http://forums.worldofwarcraft.com/th...73308319&sid=1
Account Retrieval Tips and Suggestions:
http://forums.worldofwarcraft.com/th...62836524&sid=1