Windows 10: two 1394 devices not listed in the device manager

I have two firewire devices which connect to a computer through a pci expand card with three ports. the os of the computer is win10. if I just connect any one of the two firewire devices to the computer. device manager can detect it and install the driver automatically,and it works well. but when I connect both of the devices at the same time, device manager could only detect one of the devices. how can I fix it,is there any conflictthank you


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No hardware listed in Device manager?

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Network devices listed under Unknown in Device Manager


I have a Dell Inspiron M731R laptop upgraded from Windows 8.1 to Windows 10 Home 64-Bit that suddenly quit connecting to the home network. Was using wireless, so switched to an Ethernet cable, but still no luck. I just discovered that ALL of the network-related devices are now listed under an "Unknown" tab in the Device Manager. A check of properties of each item in that folder says they are all working properly, but that obviously isn't the case. I tried uninstalling each of the 4 items, but when they are recognized again they still show up under the Unknown tab. Any suggestions would be welcome.