How to Repair api-ms-win-security-base-l1-1-0.dll? Download Now

Sometimes Windows system displays error messages regarding corrupted or missing api-ms-win-security-base-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-base-l1-1-0.dll file can therefore effect in failed execution of the started process.

api-ms-win-security-base-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-base-l1-1-0.dll related errors on your device. You can also download api-ms-win-security-base-l1-1-0.dll file compatible with Windows 10, Windows 8.1, 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 10, Windows 8.1, Windows 8.1, Windows 8, Windows 7, Windows 7

File info

General information
Filename api-ms-win-security-base-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-base-l1-1-0.dll file. api-ms-win-security-base-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-base-l1-1-0.dll file. If you encounter one listed below (or similar), please consider the following suggestions.

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



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


Problems related to api-ms-win-security-base-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-base-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-base-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-base-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-base-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-base-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-base-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-base-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-base-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-base-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-base-l1-1-0.dll file

The last solution is to manually download and replace api-ms-win-security-base-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-base-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-base-l1-1-0.dll file example directory paths.

  • Windows 10: C:\Windows\System32\downlevel\
  • Windows 8.1: C:\Windows\System32\downlevel\
  • Windows 8.1: C:\Windows\System32\downlevel\
  • Windows 8: 1: C:\Windows\System32\downlevel\
  • Windows 7: C:\Windows\SysWOW64\
  • Windows 7: C:\Windows\SysWOW64\

If the steps did not solve your api-ms-win-security-base-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-base-l1-1-0.dll
System Windows 10
File size 16800 bytes
Date 2017-03-18
File details
MD5 fec40d90318550cd51f57fe7c78321ff
SHA1 8948633c1f22d3451db87d509a44c810a691c3d8
SHA256 d4a6edf407adc6db208ebbef51380ab9d6097d64bd63c9f73158fe00ecf62686
CRC32 7b9ab4e2
Example file location C:\Windows\System32\downlevel\
Filename api-ms-win-security-base-l1-1-0.dll
System Windows 8.1
File size 8704 bytes
Date -0001-11-30
File details
MD5 558632270a5eea4280dc15b0996edc34
SHA1 82a6291d63c7d355d41e1a7a99a9dacc432c1997
SHA256 ff28978c83b8818d3ea9523840a43bccd8acfb1bad2444f3a37dd13545ed3363
CRC32 c59b90d8
Example file location C:\Windows\System32\downlevel\
Filename api-ms-win-security-base-l1-1-0.dll
System Windows 8.1
File size 5632 bytes
Date 2013-08-22
File details
MD5 75edbda9dcb47104d22aa626416f9a41
SHA1 eeef3b71bb30c5da007b89d1762ef788b629e0d5
SHA256 abddb169fb90a3f00262268b7ed8c128c0b9491ae330cf16920eaa22673b7b03
CRC32 3dcbc3f9
Example file location C:\Windows\System32\downlevel\
Filename api-ms-win-security-base-l1-1-0.dll
System Windows 8
File size 5632 bytes
Date 2012-07-26
File details
MD5 f5e61132f8f22945bbc2632b19673691
SHA1 b224f967ed8c0641b721cc41ebd29d1608c03832
SHA256 1a2e39ee6596e3ed31bec0951fae83500275f57d916c48f60dadeda54fbf479e
CRC32 75cb48ea
Example file location 1: C:\Windows\System32\downlevel\
Filename api-ms-win-security-base-l1-1-0.dll
System Windows 7
File size 6144 bytes
Date -0001-11-30
File details
MD5 140a95ea11a0320f31622f19a7d57378
SHA1 1d817c0ba495b8e01864d65c0df2386e93b584c4
SHA256 f39d4440bebb498667511416c56e00ff5e8d64ce5bf1ac815f8f21413ae4d2a5
CRC32 1fa9b526
Example file location C:\Windows\SysWOW64\
Filename api-ms-win-security-base-l1-1-0.dll
System Windows 7
File size 6144 bytes
Date 2009-07-14
File details
MD5 24ab97760c529df95d2209ccd0696b13
SHA1 aeb0147656a20fef8a074eb0bae0bb4d9f94c6c9
SHA256 951e591250e42dac3a95332ffc60892e5300f40faf0acd10fb576ce3a82b2778
CRC32 4a714291
Example file location C:\Windows\SysWOW64\