Windows 8.1 to 10 upgrade fails at 75% then rolls back

[pgudge]

Hi All,

Got a Windows 8.1 laptop that refuses to upgrade to Windows 10. I tried it back when the update was readily available/free but my father in law was travelling so didn't get much time on it. It failed a few times.

I've had it again this week, and I've tried loads of "This fixed it for me" scenarios but none work for me.

I've tried

* chkdsk/sfc first
* deleting %system%/SoftwareDownload
* using usb media (lets me select upgrade but then asks for key with no skip)
* checked device manager, no missing drivers/failed devices.
* nothing plugged in other than power

Every time it gets to 75% on the blue screen and stops, left it for over 10 hours and not moved. Turn it off and back on and restores to Windows 8.1 fine.

Any other ideas?

Thanks!

[Spreadie]

I had a similar problem with one of my tablets, but a factory restore of 8.1 prior to the update to Win 10 fixed it.

[Peter Parker]

What make, model of laptop? What devices - e.g. GPU, WiFi card?

I ask because I tried upgrading some old Samsung laptops at work, and they refused to work due to some wifi card driver issues. Even disabling the BIOS wasn't an option. The only known solution seems to be installing an Intel M.2 3160 or similar.

[MrComputerSaint]

I'd say if you have AV installed then uninstall it, before doing the install. Yes, it does open you to viruses from the internet at this time. Disconnect if you'e worried.
Maybe use the Media Creation Tool https://www.microsoft.com/en-gb/soft...load/windows10 "download tool now" button. This will create you an upgrade ISO you can use to upgrade the machine.

Also, check the application log on Windows. Start > Run > "event viewer" and you'll be able to see the different errors and you can track down what's causing the bluescreen.