yea im running windows but how does that even happen. im 99.9% sure i dont have a key logger. i work in IT and im not that dumb to get a virus and stuff that easily. they would need to have my my wallet in order to send themselves bitcoin right? it is password protected. im using multi-bit
You don't have to be dumb to get a virus and stuff, you just have to be running an insecure version of Windows. Some versions can have a running VNC server injected into memory, the attacker can log on to it as SYSTEM, and you are pwned without ever clicking on a link, or getting a funny email. Some tools let you remotely add a user.