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Hi Joke. I'm Greg, an installation specialist, 10 year Windows MVP, and Volunteer Moderator. If you will work with me I will be here to help until the issue is resolved.
Here are steps to recover from failed Updates or Version Update install which causes Windows to fail to start or function. If any steps won't work then report back and move on to the next. At least one step will always work, leading up to if necessary doing an automated Reset or a gold standard Clean Install:
- Try whichever method works in this tutorial link to get into Advanced Startup Options to run System Restore or Uninstall Updates button, or if this is a version update Go Back to Old Version: https://www.tenforums.com/tutorials/2294-advanc....
Easiest is to restart or force shutdown the PC 3 times to force it into Repair Mode.
If you are able to access System Restore or Go Back and it fails, skip to step 3.
- If necessary borrow another PC and follow the steps in the middle of this download page to create bootable installation media to access the repair options if not accessible by any other method: http://windows.microsoft.com/en-us/windows-10/m.... The bootable media is also the only method that doesn't require the password if you're stuck on that.
Boot media by powering up the PC while pressing the BIOS Boot Menu Key: https://www.sysnative.com/forums/hardware-tutor...
You may need to enter BIOS/UEFI Setup to turn off Fast Boot if it won't allow the Boot Menu key to interrupt starting Windows: https://www.mydigitallife.net/comprehensive-lis.... The bootable media also does not require password.
Choose UEFI version of media if offered, browse to second screen to Repair Your Computer link.
- Choose Advanced Troubleshoot options to run System Restore, the new Uninstall Updates button, or if this was a version Update choose More Options to Go Back to Old Version.
If it rolls back then you can hide the Windows Updates and Version Upgrade responsible until they mature by installing and running immediately the Hide Updates tool: https://www.howtogeek.com/224471/how-to-prevent...
There is a new option after Version 1809 to roll back Windows Updates from the Repair Mode in Option Four here: https://www.tenforums.com/tutorials/5486-uninst...
If this fails try a Startup Repair, or go back to Troubleshoot Options on the previous screen to Reset your PC which will save your files while reinstalling Windows.
- If that fails you can use the booted media created in Step 2 to Clean Install the latest version which should get you past all difficulties as it has hundreds of thousands of others who have followed the steps in this link and never come back to report another problem: http://answers.microsoft.com/en-us/windows/wiki... The link compiles the best possible install of Windows 10 that will stay that way as long as you stick with the tools and methods given.
There is a step to rescue files from the same bootable media: http://answers.microsoft.com/en-us/windows/wiki...
Make sure during the booted install to follow the illustrated steps to delete all partitions down to Unallocated Space to get it cleanest, then click Next to let it auto-create the needed partitions, format them and begin install - this makes it foolproof.
The media provided for the Clean Install is latest and normally the problems go away with the Clean Install, however if they don't you can find earlier version media to use here: https://tb.rg-adguard.net/public.php
Burn to DVD or create bootable 8+gb flash stick installer using this tool installed to Windows: https://www.microsoft.com/en-us/download/detail...
Then once you're back in Windows 10, you can block the problem Update using one of these methods:
https://www.howtogeek.com/223864/how-to-uninsta...
For Version Updates the most stable method to install is using the media as shown in these steps for overcoming Version Upgrade problems: http://answers.microsoft.com/en-us/windows/wiki...
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Good news, Microsoft is giving back to users more control over Updates as announced recently here: https://blogs.windows.com/windowsexperience/201...
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Finally, No expert in Forums - where we see the most cases, by the thousands - recommends Avast, AVG. Norton or McAfee, but we have solved many problems over the years by having them uninstalled.
I would uninstall any 3rd party antivirus in Settings > Apps > Apps & Features and try running only built-in Defender which gives adequate protection, best Windows performance, least issues, and is from Microsoft who knows how to protect their OS best.
After uninstalling run the cleanup tool for the AV here:
https://www.bitdefender.com/consumer/support/an...
Restart the PC, then type Security in Start Search, open Windows Defender and Firewall Settings, there and in Windows Defender Security Center fix anything that's flagged.
If you want the best on-demand scanner download and install Malwarebytes from https://www.malwarebytes.com/mwb-download/
In it's Settings > Protection > Scan Options enable Scan for Rootkits.
Then on Scan tab choose Threat Scan and Run Scan.
Clean up anything found, restart PC and then run again until it comes up clean.
If you want to keep Malwarebytes as an on-demand scanner then you can disable its Real Time trial version in it's Settings > Accounts tab.
Next check for damaged System Files by running System File Checker from Step 10 in this checklist:
http://answers.microsoft.com/en-us/windows/wiki...
If this is not enough then move to Step 11 to do a Repair Install which saves your files, apps and settings while reinstalling Windows, solves most problems.
I hope this helps. Feel free to ask back any questions and keep me posted. If you will wait to choose if I resolved your problem, I will keep working with you until it's resolved.
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Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.