Help! Wtf?

Theres someone in my computer. They call themself trinity. They keep changing my backgruond and stuff. Its screwed up. THeyre making my life hell and i wisht hey would seriously stop.

What should i do?

referrr to this post:

http://www.aimforum.com/showthread.php?s=&threadid=10315

ahhh they can read my IMs