Volume control slider will not go to maximum

The volume control slider will not advance beyond a 75% setting. When using the mouse to advance the slider to maximum, it immediately reverts back to a 3/4 setting. How to correct?
have you opened volume control and insured all are set to max?? right click on speaker icon in system tray and choose open volume control.

do you have a mic plugged in or a webcam??

any device that may have preset volume control??


try the sollution here.


also uninstall and reinstall the sound driver, I can help you find the driver if you tell me the make, model and model number of your pc, and is it a laptop or a desktop.