lsass EXE Error
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What Is lsass.exe?

lsass.exe is an extremely important system process of the Microsoft Windows operating system that handles what are known as ‘local security’ matters and issues. More specifically, it deals with handling the processes behind your initial logon on to your PC.

It basically verifies the validity of user logons to your PC/Server.

It does this by generating the process responsible for authenticating users for the Winlogon service.

It authenticates the information that a user inputs into the PC when logging on, and, assuming that this is successful, then lsass .exe generates the user's access key, which is needed to fire-up the initial opening functions of the operating system

So, lsass.exe errors can be seen in several ways, partially dependent at least on what is causing the error.

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What Causes lsass .exe Errors?

Like all programs that are part of the Windows operating system, lsass.exe relies on a small piece of sub-code called a .dll in order to operate efficiently.

Such dll’s can suffer problems because each one is generally used by several different programs, and they can become corrupted or even get removed altogether from your PC when working in other areas of your PC registry.

For example, uninstalling a program can lead to a .dll that was being used by several different programs to be accidentally removed from your PC. This will mean that the programs that need to use this .dll that are still installed on your machine will function incorrectly, or not at all.

The lsass.exe program itself can become corrupted in many different ways too.

For example, the lsass.exe program is extremely important for the stable and secure running of your computer and should under no circumstances be terminated. Nor should it be disabled in any way either.

So, if somehow lsass.exe is prematurely halted or terminated, then this could cause the program to become corrupted, and it will in all likelihood malfunction thereafter.

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More Serious lsass .exe Problems

Because it is closely related with your ability to logon to your PC, the lsass.exe program is the key to an awful lot of your most critical data.

For this reason, it is a prime target for all sorts of Trojans, spyware, adware and keyloggers.

It was also the target for one of the most vicious and virulent viruses to attack Windows-based systems, the Sasser worm. Unlike the vast majority of previous virus outbreaks, Sasser didn't even need you to use email or even be at your machine to infect your computer and continue spreading.

Sasser exploited a security weakness that Microsoft has since patched, and also led to a rash of ‘look-alike’ viruses such as Kibuv-B and Bobax, that are similarly destructive.

With all of these viruses and Trojans, the clearest indication that there might be an infection is a PC that attempts to shut down and reboot every 60 seconds or so. 

The error message caused by Sasser will indicate that the problem is with lsass.exe.

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Firstly, if you have a PC that is constantly attempting to reboot itself, indicating that you may have a serious virus or Trojan infection, then you will need to run a full and thorough virus scan to isolate those problems.

If, however, the problems that you are encountering with the lsass.exe program are not infection related, then you need to take a different approach.

Assuming that the problem lies within the functionality of the Windows operating system itself, then you might want to think first about any new programs that have recently been installed. Unless they are critical, try uninstalling them to see whether this fixes the problem.

Similarly, consider any programs that have recently been uninstalled.

Is there any likelihood that the uninstallation process could have damaged the lsass.exe program or any of the files underneath it?

Of course, the principle problem for most people would be that they would not have the levels of expertise necessary to answer these questions.

You should also appreciate that the Registry of your PC is the very heart of the operating system, and, if you try to fix it without being 110% certain that you know exactly what you are doing, then there is a very real chance that you will make the problems far worse, rather than better.

Is this a risk that you think it is worth taking?

For most people, the answer would be a categorical and definitive ‘No’.

So, in most cases, the simplest, quickest and most efficient answer to suspected lsass .exe problems would be to run a professional grade Registry scan for free, using a program like Error Repair.

Use a trustworthy tool like the Error Repair program to highlight both existing and potential Registry problems in a matter of minutes, and then you can use the same program to fix the problems in a way that you know will work!

When working with the Registry of your PC, it is always better to be safe than sorry.



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