Hi Kaspar,
As per the Windows Compatibility Center and documentation for LifeCam VX-1000, there are no drivers for Windows 8. The device is not compatible with Windows 8.
However, To use the device in Windows 8, you can install Windows 7 drivers for Windows 8 in compatibility mode.
http://www.microsoft.com/hardware/en-in/d/lifecam-vx-1000
Try the steps below and check if it helps.
a. Download the installation file from the website http://www.microsoft.com/hardware/en-in/d/lifecam-vx-1000
b. Right-click on the setup files and click on Properties.
c. Click on the Compatibility tab and check the box Run this program in compatibility mode for and select Windows 7 operating system from the drop down.
d. Click on Apply and click OK and run the file to install it.
Check if it helps. keep us posted.