I managed to get rid of them, I'm not sure what exactly did it. My brother and I are the only ones using this computer, and I don't accept files much over MSN. He probably does, but he's been really sick for a week so it wasn't him.

Balzac, it wasn't my password that was the problem. They were talking as me at the same time as I was logged in. I managed to coax out a little bit of information. They were basically piggybacking my account, so they could sit in on conversations. Weird