You have a Sony Vaio VPCS111FM and have not been able to fix a problem with audio stuttering. It is almost impossible to play a video normally because it would get stuck continuously. You have installed several updates directly from Sony support and none fixed your issue.
You can try to manually uninstall and reinstall an audio driver. Open device manager by clicking your "Start" button, then clicking "Control Panel", clicking "System and Security", and then, under "System", clicking "Device Manager". If you're prompted for an administrator password or confirmation, type a password or provide confirmation.
In a list of hardware categories, find your audio device that you want to delete, and then double click that device name. Click a "Driver" tab, then click delete driver, and follow some instructions. If you're prompted for an administrator password or confirmation, type a password or provide confirmation.
Restart your computer, then after restart install a latest audio driver manually and check if your audio stutter problem disappeared.