PC won't recognize external firewire DVD player

Hi all,

I have an external laptop 4-pin firewire DVD drive, with separate power adapter connected. The type is here:
http://support.gateway.com/s/Mobile/TabletPC/3501440/Components/5502557/5502557mv.shtml
http://support.gateway.com/s/Mobile/TabletPC/3501440/Components/5502557/5502557mvr3.shtml

It works perfectly well when connected to my laptop. I wanted to connect it to my PC, so I got a firewire 4- to 6- pin adapter, and a firewire extension cable (6-pin) to connect to my PC's new firewire PCI card (just installed). The PC recognizes direct connection of other peripherals to the firewire card, such as my iPod, but it doesn't recognize the DVD drive. When I plug in the firewire DVD drive, powered on, Windows XP doesn't respond with the usual 'external hardware detected--installing drivers' bit.

Is there any way I can get the PC to recognize the external drive? Thx in advance.

 

Does anyone have any idea how I could solve this? Thanks again in advance.