I see logs on my PC

My desktop has Vista business installed and there is a folder called Appdata which saves the logs of my yahoo messenger. I could not find any other logs though. I am not a tech person. Can someone help me with this?

hello,

help you with what precisely? what do you want to do with the logs? delete them? each program has its own location under your profile’s application data folder to store log files, there and in the “program data” folder too…browse these folders and do whatever you want with the logs.

But why the hell is it saving when I have the archives turned off? And delete it each time I use my yahoo? Or is it just yahoo? Is it any keylogger or something installed in the PC? How would I know?