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It's not the way it's done these days and as I said you can use your W7 key for free.
Nothing to do with a none genuine power pack. Probably a driver issue, so click on the link below to the Dell support site and update your drivers. If you can't do that with the D830, because of the muse issue, do you have a spare USB mouse that you can plug into a USB port, then go to the Dell site and update the drivers.
Drivers & Downloads | Dell UK |
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