Here we also use the USB method to install Windows* 7 and we don't get any problems. We do use the tool provided by Microsoft* and it works fine.
Yeah... me too. Microsoft tools are my 'default' method,,, but I THINK I may have 'figured it out'... (or maybe not..). It would seem that the previous installation on the DG41 mobo must have somehow affected the installation files on the flash drive ... (Why? I don't know..) but having again 'cleaned' the drive and re-written the files to the flash, it installed on a second DZ68DB mobo without problem... So even though I don't know for certain, I'll accept that this was the case...
"Live and learn" even now after 18 years of this stuff...