Upgrade to Windows 10
Many people have a Get Windows 10 (GWX) icon at the right side of the taskbar and clicking it will tell you if Windows 10 is available. You can also download the installation files from Microsoft too. Downloading it enables you to write it to a DVD or USB flash memory drive and install it from there.
Click the OK, let's continue button and you have a choice of starting the upgrade now or scheduling it for later. Let’s start now.
You can leave the computer to get on with the job and come back when it has finished. After three hours my computer was at the login screen waiting for me. I logged in and I was back with Windows 8.1, exactly as it was before starting.
Like a few other people, something had gone wrong with the upgrade (it got to 80% before it gave up). If it encounters an error, you may well find that the old version of Windows is restored and everything is back as it was.
Troubleshoot Windows 10 upgrade errors
The problem is that it is hard to tell where the problem lies. Something went wrong late on in the installation, but what? Some people have got a message that says:
Error code 0x800704DD-0x900016
But what is the solution?
Check the disk for errors
Open an Explorer window and go to This PC or Computer. Right click the disk drive (C:) and select Properties. Select the Tools tab and click Check in the Error checking section. What you see next depends on whether you have Windows 7 or 8, but they both do the same thing. Scan the drive for errors. This makes sure that the problem is not disk related.
Repair Windows Update
Windows Update sometimes goes wrong and it gets in a muddle. It must be reset in order to fix it and there is an app for that. Go and get the Windows Update Troubleshooter.
The button says Run now, but actually a file is downloaded. It is in the Downloads folder, so click it to run it (it can actually be run from within the browser and in Chrome there’s a button at the bottom of the window).
Problems with Windows Update were discovered and they were fixed. This looks promising, but it is not the end of the story yet and there is more work to do before attempting to upgrade once more.
Check Windows files
If you have Windows 7, go to Start, All programs, Accessories. Right click Command Prompt and select Run as administrator. If you have Windows 8, press Windows+S to open the search panel and enter command prompt. Right click it in the search results and select Run as administrator.
Now you can enter sfc /scannow.
What this does is to check that Windows files are all present and correct. It can take several minutes to complete. In my case it reported that corrupt files were found, but they could not be repaired. So there is still a problem that needs fixing before upgrading.
Enter dism.exe /Online /Cleanup-image /Restorehealth
This command is similar to sfc, but is better. It checks Windows files on the disk against the versions that Microsoft has online and where it finds a difference, it replaces the one on the disk with Microsoft’s pristine copy online.
Notice that the operation was completed successfully and that component store corruption was repaired.
Uninstall security software
You should not need to uninstall your security software, but it is a good idea to remove it just in case it is interfering with the upgrade.
You can go to Programs and Features in the Control Panel to do this, or better still, use an uninstaller like IObit Uninstaller, which removes any left-over files and registry data.
That is it. You can now try upgrading to Windows 10 again. Hopefully it will work this time. It is a good idea to have a backup of the disk drive just in case though.
Fix Windows 10 upgrade faults
- Check the disk for errors
- Run Windows Update Troubleshooter
- Use sfc to check Windows files
- Use dism.exe to check Windows files
- Uninstall all security software
- Cross your fingers and hope it now works!