I've been using the 6300 softaware since XP was in Beta for my 4100c. The front buttons don't work half the time so I lanuch from the start menu. [http://h20015.www2.hp.com/en/softwareDownloadIndex.jhtml?reg=&cc=us&softitem=sj674en&prodId=hpscanjet618414&lc=en&sw_lang=en&pagetype=software] It's the 95.27 MB download. You might try the button fix file. I can't remenber if I have or not. Also you may have problems installing on a system that you have tried other drivers and fixes so you might have to do a clean install of Windows. This would be best anyway. Hope this helps.
Reyede