HP Cue Device Discovery – HPQDDSVC.DLL
Hpqddsvc.dll will be found in your c:\Program Files\HP\Digital Imaging\bin\ folder. It detects and monitors CUE devices (such as printers or scanners) on your system. If this file isn't causing you problems, we'd recommend leaving it in place. If you want to disable this file using Windows Vista, go to Control Panel > Administrative Tools/Services and turn off the "HP Cue Device Discovery" service. Alternatively, you can remove this file using WinPatrol.
You'll find the latest drivers and software downloads at http://welcome.hp.com/country/us/en/support.html?pageDisplay=drivers.
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Hewlett Packard