Hi ali213 ,
I dont blame you for not trusting anyone on your pc if i have picked you up right on this?
Do you mean people are logging into your Yahoo Messenger,
Cheeky so and so's,
Go to contacts on your messenger and look to near the bottom of the drop down menu you should see "Message Archives" that will give you the last log on chats,
But if someone is cheeky enough to use your messenger without your knowledge then i would think they would delete the last log.