Have you updated to 9.02? (with the Adobe Updater)
You may want to start with the technical support document that matches your OS:
yeh i have updated still not working
Please provide us some info about what version of Windows and your hardware. If it makes a sound, it means that ther system thinks you triggered some incorrect mouse interaction which in turn could point to a graphics problem. AE by itself does not produce any event sounds except for the ones on the render queue...
PS: And, BTW, be careful to not mark your threads as answered before you got a solution. if it is marked as resolved, people will usually skip over it and you will not get any further help....