Any Windows user who has already opened their computer’s Task Manager and navigated to the Process tab may have seen a running process called winlogon.exe.
At first glance, even inexperienced Windows users may conclude that winlogon.exe is a Windows process, since the process name contains the term “win” and the process name also contains the term “logon”, these are Windows logon procedures. But that’s not all there is at winlogon.exe. In reality, the winlogon.exe process can be one of two things: an absolutely reliable and critical Windows process for optimal performance, or a virus, Trojan horse, worm or spyware that bears exactly the same name as the legitimate winlogon.exe.
At the time it was first released, Windows 8/10 had a number of problems. After a while, when Microsoft started releasing updates, some bugs were fixed, but many of them were not. One of these errors is related to the hexadecimal code 0xc000021a.
It indicates that your PC has encountered a problem and needs to be restarted. This error appears in a blue screen of death. It can therefore have serious problems that damage the internal structure of the Windows operating system. This error persists even after rebooting the PC. System recovery does not work either. So you would certainly want to know the reason for this ridiculous error message.
Winlogon.exe can be the main cause of this error. This file is an important component of the system that manages the logon and logoff processes, so that such errors can completely disrupt the stability of your computer. It can be damaged by mismatching system files or third-party software.
Solutions to correct Winlogon.exe errors:
Method 1: Repair corrupted system files.
Download and run a software tool to search for corrupted files. If damaged or missing files are found, repair them.
Method 2: Check the problem in ‘Safe Mode with Network’.
‘Safe Mode with Networking’ starts Windows in safe mode and contains the network drivers and services needed to access the Internet or other computers on your network.
Click on the following link to learn more about ‘Safe Mode with Networking’:
If the problem does not persist in safe mode with networking, boot the computer to a clean state and check if the problem persists.
a. When you boot your system in a clean state, you can determine whether third-party applications or boot items are causing the problem.
b. Check for more information on how to troubleshoot a problem while performing a clean boot on Windows Vista or Windows 7:
I strongly recommend that you run the antivirus scan in ‘Safe mode with the network’.
Method 3: Solve the problem with the SFC scan
If the above method does not solve your problem, you can use the system file checker to solve problems related to corrupted files that cause this error. Perform a full SFC scan on your PC.
Method 4: BIOS Reset
If you notice that the BIOS on your Windows computer has been corrupted, you can easily restore the default BIOS settings. A corrupted BIOS can result from a bad BIOS update, a malicious infection, a sudden power failure, an excessive optimization, etc. In either case, or if you have problems booting, installing or loading the Windows operating system, you should reset the BIOS.
For those who do not know BIOS or Basic Input Output System is a firmware, stored on a chip on a part of the motherboard of the computer, which is basically a set of instructions that run to load the operating system. When you turn on the computer, the BIOS commands are triggered and the operating system is loaded when finished.
The procedure to restore the default BIOS settings is more or less the same computer, be it a Dell, HP, Lenovo, Sony, Acer, ASUS, Toshiba, Panasonic and so on.
Start your computer and press F10 after turning it on, which works on most laptops, including Dell. On an HP laptop, it may be the F2 key. You can see the buttons that work for your hardware when you start in the lower left or right corner under Startup Options or Configuration.
Method #5 : Replace all corrupted registry hive files with backups.
Your computer may be affected by this problem because Windows tries to access important registry files when it starts (as it should), but cannot access them because they have been damaged or corrupted. If this is the case, replacing all files in the corrupted registry hive with their backups should solve the problem.
However, because your computer does not boot, you cannot replace the corrupted registry using File Explorer – you must do so from a command prompt in the Windows recovery environment.