ton fichier DLL est manquant ou endommagé.
voici un copié collé de la résolution du pb ( provenant du support microsoft)
c'est en anglais mais c po bien compliqué , jte laisse traduire )
In Control Panel, double-click the Multimedia icon.
On the Devices tab, double-click Media Control Devices.
Click the Motion Video Device media control, click Properties, and then click Remove.
Shut down Windows, turn off your computer, leave it off for at least three seconds, and then turn it back on.
In Control Panel, double-click the Add New Hardware icon.
Click Next, click No, click Next, click Other Devices, and then click Next.
In the Manufacturers box, click Microsoft MCI. In the Models box, click Motion Video Device (Media Control), and then click Next.
Click Finish. When you are prompted to restart your computer, do so.