> I am using XP sp2.
>
> My printer is a Canon PIXMP 780. I don't really know what drivers I
> am using. The ones that came with the printer.
>
> The program I intended to assign the "black" button to is called MP
> Navigator 1.0.
>
> I am really not sure what the actual function I did assign the key to
> was.
>
> Thanks
I am not familiar with this product or software. However, you might want to
update your software to the latest version 1.04.
http://alpha03u.c-wss.com/inc/ApplServlet?SV=WWUCA900
In Windows XP you can go into My Computer and rt-click on the scanner to
bring up properties ( the 780 is a multifunctional machine and some button
assignments are found under the scanner section), select the events tab,
then select the event assignment and then the action preferred. Hope this
helps.