Hi honza,
Sorry for the late response, I was out of the office. Lets check if the camera is even detected by the computer to begin with. Device manager can be accessed by right clicking on my computer and left click to properties. Under the system properties screen please select the hardware tab and hit the device manager button.
Under device manager check if the camera is listed under imaging device. If its not listed check if you see a category that says other devices. If a device is listed under other devices category you can check the properties of the device (double click the device or right click then hit properties) and select the details tab.
Please select the hardware ID from the dropdown category. Please provide me with the copy of the hardware id listed.
You can check out this link for additional information. How to identify your webcam.
Please PM me the information about your laptop's serial no. and the full machine type and model. This way we can double check the devices that came preloaded with the system.
Don