Hello,

I am trying to upgrade some of our E6540 laptops to Windows 10.  I have a few that have been successful, while many others fail.  The ones that fail have both Intel HD 4600& AMD Radeon HD8790m video and Intel 6235 WiFi and Bluetooth adapters, while the successful ones have Intel Centrino Untimate N 6300 wifi and Intel HD 4600. I am not seeing any other differences. I have updated the BIOS and chipset drivers, disabled and uninstalled the wifi, bluetooth, and AMD drivers and Win 10 still fails to install.  It gets to checking updates ~30%, the restarts and says "Undoing changes made to your computer" and reboots to Win 7. Looking at Sources/Panther compat files I can see some inf files oem0, oem1, oem42, oem24.inf are set to "true" in blocking migration.  Those files are the AMD driver, Intel driver, XPS document. I am not sure what to do next since some of my 6540 do work with a Win 10 upgrade.