@ AlHill: Thank you for the fast help.
BIOS has been updated successfully. However the problem still persists:
My Hauppauge WinTV-HVR-4400 PCIe card will not be detected by Windows10 device manager. I tryed it in PCIe-X1 and PCIe-X4 slot. Thus the driver will not be installed. The TV card is okay (works well in my older PC).
The H. support team believed it to be a BIOS problem. Hence my earlier request for latest BIOS update. Any ideas?