Observe the hard drive activity LED closely to determine if the computer is still working. If the LED is still blinking, it means the setup is probably still busy working on sorting through your files and determining what to move and what to keep. This is a good sign, which means you should wait a bit more. If the setup goes beyond 2 to 7 hours, then the setup may be stuck.
or you can also do this:
Power down your computer completely and try again. Follow these steps:
Power down the computer completely. If it doesn’t shut down, hold the power button for 5 to 10 seconds until it shuts down.
Disconnect from the internet by unplugging the Ethernet cable or switching off the wireless adapter (if possible). See this post for more information on disabling LAN connections before a Windows 10 setup.
Disconnect all unnecessary peripherals from the PC. Remove external hard drives, game controllers, phone chargers—pretty much everything but the keyboard and mouse.
Remove power from your computer. Disconnect the power cord from the outlet. If it’s a laptop, remove the battery, too. Wait at least 30 seconds before plugging your computer back in. (Note: If you have the time to spare, leave the computer unplugged for up to an hour. This will help if your computer started to get overheated.)
Connect the system to power again, but leave the internet disconnected—power on the computer.
Hopefully, Windows will try to resume or restart the Windows 10 setup process.
If the installation completes normally and you get to a Windows desktop with a Start menu and everything, go ahead and reconnect to the internet to finishing downloading and applying updates.
If the setup rolls back to your previous version of Windows, try upgrading manually using the Media Creation Tool or an ISO file.
