AIM Mystery User Registered On My Comp ?

I suddenly have a new user registered on my AIM. I am the only one that uses the computer. The username "wvactom"appears automatically when XP starts and when I start AIM manually. It replaced my default AIM username. I do believe my old username is still stored in memory though.

Is this a concern in regards to viruses, spyware, etc.? I was not sure what forum to post in so I posted here.

Thanks.

 

Open AIM, and while the screenname is highlighted in the signon window, press delete. then exit out of aim, and see if it reappears, if it reappears you have a virus.