Just found these 2 reviews, you don`t need a power lead.
I would try installing again, did you have scanner plugged in and turned on when you put the disc in.
1. Good quality for the Price
Review of Packard Bell Diamond 1200 Plus by ruthpern
Advantages: Powered from the USB cable
Disadvantages: Fax option, but no sheet feeder.
I got it home and opened the box.
What was in the box?
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The scanner, instruction manual and CDs.
The CDs had software and drivers on them and the manual was, well, a manual.
How easy was it to install?
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2. The CD autoran and asked me a few questions about licences and where I wanted to put the software and that was that.
The scanner itself is USB plug and play and is even powered from the USB port so no need to find an extra plug socket.
I didn't need to use the manual.