Is that the request for a CD? You can turn that off in the VM edit window. Something about enable at startup; uncheck it. However, when you do this you will need to use a CD you will need to activate it from the Tools menu.
I assumed that if I turned that off, then the VM won't recognize a CD should I insert one later. Basically, I just want CD management to be automatic - if there's no CD at startup, that should be fine. If I put one in later, then it should get recognized. D