Have you updated it recently? I've never had a problem with it. I just "print" PDFs to my desktop with it. For scans I use the supplied software from HP and Canon.
Ooof HP printer drivers are horrible, once the ink tanks went dry I binned the printer/scanner (scanner lasted 80 pages!)
Well documents are fine but for some reason my Win 7 PC just rotates the images 90 degrees to the left after you highlight them and send them to Primo PDF. Latest version but this is the fastest PC I have so might have to piss about with an XP install.