How can I get rid of this message

I?m having a problem with Acrobat Reader. Every time I boot up, I?m getting a message that says if I want to install Acrobat reader 3.0, click YES or NO. I click NO. Because I have 5.0 already install. How can I get rid of this message at boot up asking me if I want to install this older version of Acrobat Reader?