Ok,
I dont know if you have tried this;
But does the scanner appear in "My Computer" ?
And if yes, is it possible to do a preview/scan of the document from there ?
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There are several applications that do scanning e.g photoshop, and I dont remember having problems with a HP scanner.
The HP application that comes with it works fine - and ties the scanning application with the scanner object that appears on "My computer"
my 3 cents