After update of my windows 10 I got problem Desktop is unavailable

This is obviously useful information but my questions are (1) why does it happen in the first place? and (2) how can I get my pc to update without crashing? I can't keep doing this every time it fails and I know I was close to giving up with the update to v1709 and had to get help with it. Microsoft doesn't seem to have any answers which is not only pathetic but bad business and makes me angry.

Things you will need:

8GB or larger blank USB stick

a functioning Windows PC to use briefly

about an hour or two of spare time

Steps:

1. Turn on the problem computer.
2. At the blue screen, choose your language. [fig. 1]
3. Choose “Use another operating system”. [fig. 2]
4. Choose the second option, “Windows 10 on volume [x]” [fig. 3] Mine was the third option-above or below from the rollback option
5. Wait for the computer to boot to the desktop (if necessary, enter your password to login). You may have to wait a long time for the desktop to appear, while the “update” gets ready.
6. Once the desktop attempts to load, close any error message that appears.
7. On a functioning Windows PC, go to www.microsoft.com/en-us/software-download/windows10.
8. Click “Download tool now”. Disable any antivirus on the functional PC before proceeding to step #9.
9. Run the tool you downloaded, and follow the simple steps to create a Windows 10 installation USB stick (on your BLANK USB drive). The only option you should check is to make sure it is a 64-bit or 32-bit version. Your computer is MOST LIKELY 64-bit, and if you install the 32-bit version when you don’t need it, you’re probably going to have a bad time.
10. On the problem computer, right-click the taskbar, then click “Task Manager”.
11. Click “More details” so that you can see the menu bar. [fig. 4]
12. Click “File”.
13. Click “Run new task”. [fig. 5]
14. In the dialog that appears, check the box “Create this task with administrative privileges”.
15. Click “Browse…”
16. Navigate to your USB drive and select “setup.exe”.
17. Run the file and follow the steps to “upgrade” Windows. Uncheck the boxes for “check for new updates” and to “help make this version better”.
18. Let the process run, which may take some time. Once completed, the computer should be back to normal, and fully up-to-date. You may need to re-login to your Microsoft Account.
19. While it is not necessary to remove your third-party antivirus software, we’d recommend that you remove it anyway, given that it likely caused the issue. Windows Defender is built in to Windows 10, is free of charge, and is quite adequate for consumer-level protection

Things you will need:

8GB or larger blank USB stick

a functioning Windows PC to use briefly

about an hour or two of spare time

Steps:

1. Turn on the problem computer.
2. At the blue screen, choose your language. [fig. 1]
3. Choose “Use another operating system”. [fig. 2]
4. Choose the second option, “Windows 10 on volume [x]” [fig. 3] Mine was the third option-above or below from the rollback option
5. Wait for the computer to boot to the desktop (if necessary, enter your password to login). You may have to wait a long time for the desktop to appear, while the “update” gets ready.
6. Once the desktop attempts to load, close any error message that appears.
7. On a functioning Windows PC, go to www.microsoft.com/en-us/software-download/windows10.
8. Click “Download tool now”. Disable any antivirus on the functional PC before proceeding to step #9.
9. Run the tool you downloaded, and follow the simple steps to create a Windows 10 installation USB stick (on your BLANK USB drive). The only option you should check is to make sure it is a 64-bit or 32-bit version. Your computer is MOST LIKELY 64-bit, and if you install the 32-bit version when you don’t need it, you’re probably going to have a bad time.
10. On the problem computer, right-click the taskbar, then click “Task Manager”.
11. Click “More details” so that you can see the menu bar. [fig. 4]
12. Click “File”.
13. Click “Run new task”. [fig. 5]
14. In the dialog that appears, check the box “Create this task with administrative privileges”.
15. Click “Browse…”
16. Navigate to your USB drive and select “setup.exe”.
17. Run the file and follow the steps to “upgrade” Windows. Uncheck the boxes for “check for new updates” and to “help make this version better”.
18. Let the process run, which may take some time. Once completed, the computer should be back to normal, and fully up-to-date. You may need to re-login to your Microsoft Account.
19. While it is not necessary to remove your third-party antivirus software, we’d recommend that you remove it anyway, given that it likely caused the issue. Windows Defender is built in to Windows 10, is free of charge, and is quite adequate for consumer-level protection

I have had exactly the same problem and replies that tell you to use a menu are useless when you have no desktop! After a couple of tries at rebooting, the only solution was to hold the on/off switch down long enought to force it to close and reboot. I think it was on the third time of doing this that it finally restored the previous version, from the day before the update went wrong. I had untold problems for weeks after the last big updates and I despair of Microsoft geting it right now. I still don't know what will happen when it eventually tries to update itself again.