Maybe it'll help I have a DC10 myself, and I use Windows95, but I had the same message some time, so maybe it can be off some help dispite the difference in OS. I uninstalled the software after moving the card to another PCI slot (interrupt problems) and then installed the software again. When I rebooted the system the card was discoverd and reinstalled by Windows, but the problem was that at the moment of installing the software, Windows was still thinking the card was in the old slot, so the software never looked at the new slot Windows so happily found after rebooting. I again un-installed and after a new installation, at which the software did get the correct info from Windows, the card was correctly found and the message was gone (The card still doesn't work, but thats a completely different problem).
The greatest: DC30 will work with XP If you use NTFS+W2k or XP there is no capture limit. Known limitations: 1. Sound capture will only work with separat so. At the moment you can use AMCAP (on my hp section video) or Pinnacle Studio 7/8/7SE (you must buy it, Trial Version will not run). Need to get the driver.