Somehow my networking drivers were all wiped out last night and the only one I can't get to work is the DCT.  In device manager I see:

ATI TV Wonder OpenCable Receiver - This device is not working properly because Windows cannot load the drivers required for this device. (Code 31)

I've tried uninstalling the driver, rolling it back, disabling, updating etc.  I can't figure out how to troubleshoot this since most people find that their vista media center just recognizes the DCT.  I've tried running the firmware update and the ATI program won't detect the DCT.

Can anyone offer some assistance?  Is there a driver file I can use to update the driver and specifically have it use the right one?  Or is this "cannot load" error a symptom of something else?

Thanks in advance for any help you can provide.

Sounds like the driver on disk was corrupted somehow.  Your best bet would be to do a system restore to a time when everything was still working.