api-ms-win-security-lsalookup-l1-1-0.dll Troubleshoot and Download

Sometimes Windows system displays error messages regarding corrupted or missing api-ms-win-security-lsalookup-l1-1-0.dll files. Situations like that can occur, for example, during a software installation process. Each software program requires certain resources, libraries, and source data to work properly. Corrupted or nonexistent api-ms-win-security-lsalookup-l1-1-0.dll file can therefore effect in failed execution of the started process.

api-ms-win-security-lsalookup-l1-1-0.dll file ApiSet Stub DLL. The file was developed by for use with software. Here you will find detailed information about the file and instructions how to proceed in the event of api-ms-win-security-lsalookup-l1-1-0.dll related errors on your device. You can also download api-ms-win-security-lsalookup-l1-1-0.dll file compatible with Windows 8.1, Windows 8, Windows 7, Windows 7 devices which will (most probably) allow you to solve the problem.

For Windows Compatible with: Windows 8.1, Windows 8, Windows 7, Windows 7

File info

General information
Filename api-ms-win-security-lsalookup-l1-1-0.dll
File extension DLL
Description ApiSet Stub DLL
Program Microsoft® Windows® Operating System
Author Microsoft Corporation
MIME type application/octet-stream
File type Dynamic link library
System Windows NT 32-bit
Copyrights © Microsoft Corporation. All rights reserved.
Character set Unicode
Language cod English (U.S.)
Fix File Errors

There are various types of errors related to api-ms-win-security-lsalookup-l1-1-0.dll file. api-ms-win-security-lsalookup-l1-1-0.dll file may be located in wrong file directory on your device, may not be present in the system, or may be infected with malicious software and therefore not work correctly. Below is a list of most common error messages related to api-ms-win-security-lsalookup-l1-1-0.dll file. If you encounter one listed below (or similar), please consider the following suggestions.

  • api-ms-win-security-lsalookup-l1-1-0.dll is corrupted
  • api-ms-win-security-lsalookup-l1-1-0.dll cannot be located
  • Runtime Error - api-ms-win-security-lsalookup-l1-1-0.dll
  • api-ms-win-security-lsalookup-l1-1-0.dll file error
  • api-ms-win-security-lsalookup-l1-1-0.dll file cannot be loaded. Module was not found
  • cannot register api-ms-win-security-lsalookup-l1-1-0.dll file:
  • api-ms-win-security-lsalookup-l1-1-0.dll file could not be loaded
  • api-ms-win-security-lsalookup-l1-1-0.dll file doesn't exist



Application could not be started because api-ms-win-security-lsalookup-l1-1-0.dll file is missing. Reinstall the application to solve the problem.


Problems related to api-ms-win-security-lsalookup-l1-1-0.dll can be addressed in various ways. Some methods are meant only for advanced users. If you don't have confidence in your skills, we suggest consulting a specialist. Fixing api-ms-win-security-lsalookup-l1-1-0.dll file errors should be approached with utmost caution for any mistakes can result in unstable or unproperly working system. If you have the necassary skills, please proceed.

api-ms-win-security-lsalookup-l1-1-0.dll file errors can be caused by various factors, so its is beneficial to try to fix them using various methods.

Step 1: Scan your computer for any malicious software

Virus Scan

Windows files are commonly attacked by malicious software that prevents them from working properly. First step in addressing problems with api-ms-win-security-lsalookup-l1-1-0.dll file or any other Windows system files should be scanning the system for malicious software using an antivirus tool.

If by any chance you don't have any antivirus software installed on your system yet, you should do it immediately. Unprotected system is not only a source of file errors, but, more importantly, makes your system vulnerable to many dangers. If you don't know which antivirus tool to choose, consult this Wikipedia article – comparison of antivirus software.

Step 2: Update your system and drivers.

Windows Update

Installing relevant Microsoft Windows patches and updates may solve your problems related to api-ms-win-security-lsalookup-l1-1-0.dll file. Use dedicated Windows tool to perform the update.

  1. Go to the Windows "Start" menu
  2. Type "Windows Update" in the search field
  3. Choose the appropriate software program (name may vary depending on your system version)
  4. Check if your system is up to date. If any unapplied updates are listed, install them immediately.
  5. After the update has been done,restart your computer in order to complete the process.

Beside updating the system, it is recommended that you install latest device drivers, as drivers can influence proper working of api-ms-win-security-lsalookup-l1-1-0.dll or other system files. In order to do so, go to your computer or device producer's website where you will find information regarding latest driver updates.

Step 3: Use System File Checker (SFC) tool

System File Checker

System File Checker is a Microsoft Windows tool. As the name suggests, the tool is used for identyfing and addressing system file related errors, including those related to api-ms-win-security-lsalookup-l1-1-0.dll file. After an error related to%fileextension% file has been discovered, the program attempts to automatically replace the api-ms-win-security-lsalookup-l1-1-0.dll file with properly working version. To use the tool:

  1. Go to the Windows "Start" menu
  2. Type "cmd" in the search field
  3. Locate "Command Prompt" result – don't run it yet:
  4. Click the right mouse button and select "Run as Administrator" option
  5. Type "sfc /scannow" in console prompt to start the program and follow the instructions

Step 4: Restoring Windows system

Windows Recovery

Another approach is to restore system to previous state, before the api-ms-win-security-lsalookup-l1-1-0.dll file error occured. In order to restore your system, follow the instructions below

  1. Go to the Windows "Start" menu
  2. Type "System Restore" in the search field
  3. Start the system restore tool – it's name may differ depending on version of the system
  4. The application will guide you through the process – read the messages carefully
  5. After the process has finished, restart your computer.

If all the above-mentioned methods failed and the api-ms-win-security-lsalookup-l1-1-0.dll file problem has not been resolved, proceed to the next step. Remember that the following steps are intended only for advanced users.

Download and replace api-ms-win-security-lsalookup-l1-1-0.dll file

The last solution is to manually download and replace api-ms-win-security-lsalookup-l1-1-0.dll file in appropriate folder on the disk. Select file version compatible with your operating system and click the "Download" button. Next, go to your web browser's "Downloaded" folder and copy the downloaded api-ms-win-security-lsalookup-l1-1-0.dll file.

Go to the folder where the file should be located and paste the downloaded file. Below is the list of api-ms-win-security-lsalookup-l1-1-0.dll file example directory paths.

  • Windows 8.1: C:\Windows\System32\
  • Windows 8: 1: C:\Windows\System32\
  • Windows 7: C:\Windows\System32\
  • Windows 7: C:\Windows\System32\

If the steps did not solve your api-ms-win-security-lsalookup-l1-1-0.dll file problem, you should consult a professional. A probability exists that the error(s) might be device-related and therefore should be resolved at the hardware level. A fresh operating system installation might be necessary – a faulty system installation process can result in data loss.

File versions list

Filename api-ms-win-security-lsalookup-l1-1-0.dll
System Windows 8.1
File size 3072 bytes
Date 2013-08-22
File details
MD5 58de94fffee3c19d32cf476d21b1c217
SHA1 9f7a939d64d7a215a415d13de9ab5830a4096fb6
SHA256 9dc1408538a571c2cbb3a905de270135e74ebf35bb84a99d2afb6e9bda811c94
CRC32 723df8e5
Example file location C:\Windows\System32\
Filename api-ms-win-security-lsalookup-l1-1-0.dll
System Windows 8
File size 3072 bytes
Date 2012-07-26
File details
MD5 f76b058480693adfa0df8456c8198afc
SHA1 bb6ce665bc23feddd3726e0e1436dc0ac67e6881
SHA256 53bcd99361ebcd790a8d393641cee9f752ace81a76de034389a431aa12e37f7f
CRC32 55a0f905
Example file location 1: C:\Windows\System32\
Filename api-ms-win-security-lsalookup-l1-1-0.dll
System Windows 7
File size 3584 bytes
Date 2009-07-14
File details
MD5 99c885a040571d5cc7b4497109bffe6e
SHA1 549fd5735b729085aa6da0f6a4c6e4ce1ec59c1a
SHA256 47d2eb98891362ac82d5adda0d8d5c50e9cd7c1023bda5d4008371dbcb573cd9
CRC32 cb654a8b
Example file location C:\Windows\System32\
Filename api-ms-win-security-lsalookup-l1-1-0.dll
System Windows 7
File size 3584 bytes
Date -0001-11-30
File details
MD5 c38e38a59f0baf05e7268ec8a9acc44a
SHA1 300571b5ef4a068e5cdeb6a17df7bd1620e67d6f
SHA256 bd68dca02f1a6c3437327f2085932ef637a83c2c862185e5e63cd270bbef22a8
CRC32 fbe2bcc2
Example file location C:\Windows\System32\