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#11
On a couple of my Dell systems (a laptop and a desktop), I did an clean install of Window 7 first. I then made sure that Windows 7 was completely updated and that all of the drivers were working. I also made sure that the system had the latest available Dell drivers and bios.
After this, I then performed the Windows 10 upgrade. All of my upgrades were successful using this method and without problems.
Previous to all of this, of course, I backed up all of my personal data and restored it to the PC after the Windows 10 update.