What is the Lsass.exe errors - How to fix this errors?

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

If you still have access to your Windows (if it is at least booting into Windows), you'll want to prevent the shutdowns post-haste.

This is a pretty simple process. Just go to Start > Run (or press the Cmnd or "Windows" button). In the Run box, type in the command "shutdown -a".

While this won't ride you of your error/virus problem, it will prevent the debilitating shutdown process that the error is infamous for. This will allow you to continue troubleshooting your PC until you get rid of the problem.

Scan Your System for Sasser Virus

The first process in your troubleshooting will be looking for a virus. Since most lsass problems consist of this infection, it will be the first place to look.

Scanning for viruses is pretty simple. Simply download the program of your choosing and follow the instructions it gives you.

Not all antivirus programs are created equal. I suggest trying a few different free ones until you find one that is easy to use and does the job properly for you.

I would also strongly consider a registry cleaner. Because the registry is a particularly vulnerable area on your computer, it is important to keep it in order and free of program fragments and infection.

NOTE: Always keep a firewall active!

For Advanced Infections, Reinstall Windows

If you are not able to access Windows at all (it keeps rebooting before Windows loads, even when you try to enter in Safe Mode), then you'll likely need to install Windows over the top of the old.

The process is pretty simple. You'll just want to install Windows from your Windows disk to the same directory as your original copy. It should overwrite any errors without resetting any of your user settings, programs, etc.

For more information on how to keep your system free of lsass.exe errors, check out the information here.

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