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I just checked on the Canon USA site here, and selected Wndows XP as the OS. The driver presented shows Windows Vista in the file name (D700_PrtDriverV110_WinVista_EN.exe), but the next screen shows that it is compatible with Windows 2000, Windows XP, and Windows Vista. I would try uninstalling (if it is installed) whatever driver you currently have installed for your D780, then download and install this driver. Leave the unit turned off until the installation program asks you to connect/turn it on.