Lsass.exe is an executable file that stands for “Local Security Authentication Server”. It is an integral part of the Windows operating system that helps in verifying login details of the user on your computer system server. It creates the procedures that are responsible for authenticating users for the services of Windows and keeps your system free from unauthorized access. It consists of the required data to help you to modify your authentication and also considered as the Microsoft Windows data file which is by default located in the c:\windows\system32

As this file is vital component so it should not be deleted from the Task Manager. If somehow this executable process misplaced, deleted or lost, then it will definitely create troubles in Windows. Once it gets corrupted, you might encounter the Lsass.exe error message, as follows:
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Lsass.exe errors can be a nasty problem that likes to shutdown Windows and cause problems restarting and loading back into windows.

Lsass errors are most commonly caused by a virus. The “Sasser” virus was recognized a bit too late by Microsoft, so the security update came a bit after the fact.

The first thing you’ll want to do, if your Windows is still operational, is to install the “Sasser” update to your Windows.

While this probably won’t fix your PC outright, it will help in the prevention of further infection. You’ll probably want to go through the following troubleshooting, depending on the severity of your infection.

Prevent Windows Shutdown
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An lsass.exe error is just one of the many executable files in a computer operating system caused by conflicting registry entries in the system. These error files are usually broken, fragmented, corrupted, invalid or even outdated. There are various ways to fix the problem from manually fixing the corrupted files to using registry cleaner programs, which would allow you to automatically detect and fix Windows Registry problems. System Restore is also one of the many solutions that can be undertaken upon the occurrence of an lsass.exe error
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