What Google Adsense can track.

There is a misunderstanding  among many people that Google Adsense can track  what ever you are doing and can track even your computer with upto the processor's  id number. 
They are wrong. Google Adsense can track only your online activity and they can track your activity only if you are using any of the Google's services, such as youtube.com, orkut.com,gmail.com etc.
They can track if and only if you don't delete the cookies which they put into our system. You have to delete it every time you have logged out of any of the Google's services.  You can find the cookies in you temporary internet files folder located at C:\Documents and Settings\admin\Cookies. Google can track your other online activities if you have installed their tool bar into your browser. I recommend you to uninstall any of the tool bar if you had one in your system. Google can only track your online activities associated with its products and nothing else.