bootstr.dll Informations - Download and Fix

Sometimes Windows system displays error messages regarding corrupted or missing bootstr.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 bootstr.dll file can therefore effect in failed execution of the started process.

bootstr.dll file Boot String Resource Library. 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 bootstr.dll related errors on your device. You can also download bootstr.dll file compatible with Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista devices which will (most probably) allow you to solve the problem.

For Windows Compatible with: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista

File info

General information
Filename bootstr.dll
File extension DLL
Description Boot String Resource Library
Program Microsoft® Windows® Operating System
Author Microsoft Corporation
MIME type application/octet-stream
File type Executable application
System Windows NT 32-bit
Copyrights © Microsoft Corporation. All rights reserved.
Character set Unicode
Language cod English (U.S.)

There are various types of errors related to bootstr.dll file. bootstr.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 bootstr.dll file. If you encounter one listed below (or similar), please consider the following suggestions.

  • bootstr.dll is corrupted
  • bootstr.dll cannot be located
  • Runtime Error - bootstr.dll
  • bootstr.dll file error
  • bootstr.dll file cannot be loaded. Module was not found
  • cannot register bootstr.dll file:
  • bootstr.dll file could not be loaded
  • bootstr.dll file doesn't exist



Application could not be started because bootstr.dll file is missing. Reinstall the application to solve the problem.


Problems related to bootstr.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 bootstr.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.

bootstr.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 bootstr.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 bootstr.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 bootstr.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 bootstr.dll file. After an error related to%fileextension% file has been discovered, the program attempts to automatically replace the bootstr.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 bootstr.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 bootstr.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 bootstr.dll file

The last solution is to manually download and replace bootstr.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 bootstr.dll file.

Go to the folder where the file should be located and paste the downloaded file. Below is the list of bootstr.dll file example directory paths.

  • Windows 10: C:\Windows\System32\
  • Windows 8.1: C:\Windows\System32\
  • Windows 8: 1: C:\Windows\System32\
  • Windows 7: C:\Windows\System32\
  • Windows Vista: C:\Windows\System32\

If the steps did not solve your bootstr.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 bootstr.dll
System Windows 10
File size 3072 bytes
Date 2017-03-18
File details
MD5 1b4f59b23a7863a11b0647a3f60c3183
SHA1 52ce0990a626dc723da4959cee862fe27cda0221
SHA256 2e4f862e4ed318cdd7d56ec267fd38604fc92fd2813bcc512f2ac5c6a31267db
CRC32 ca78a80f
Example file location C:\Windows\System32\
Filename bootstr.dll
System Windows 8.1
File size 2560 bytes
Date 2013-08-22
File details
MD5 65c575b3e8f1904d774f915ffa142d69
SHA1 1d36c29d8dc9553cb6b918e6a7dd3744a3d854ed
SHA256 32969abfb7bc6ae3444ecbc7d41d22b2bc71731fdb95370a74f3cc5988fc09a7
CRC32 47390790
Example file location C:\Windows\System32\
Filename bootstr.dll
System Windows 8
File size 2560 bytes
Date 2012-07-26
File details
MD5 7aa6b0b6c7a329690fb24e137ef0a70f
SHA1 f5c5384c45b6ac134be1ac1f2eb637fd6457141e
SHA256 6d586a01c83f656512890c01a1ea72816e04b09fd013efe3a1126ab58479c12c
CRC32 94b10daf
Example file location 1: C:\Windows\System32\
Filename bootstr.dll
System Windows 7
File size 2560 bytes
Date 2009-07-14
File details
MD5 e998de48ffbd5010064e82a7af84ff05
SHA1 160d5bd8aaf0770ab43499de41362b63780489f9
SHA256 55d18302797e42af761960131b4df71f6b9c116abaee2ddb6ab54da5a32c4fda
CRC32 418cd014
Example file location C:\Windows\System32\
Filename bootstr.dll
System Windows Vista
File size 2560 bytes
Date 2008-01-21
File details
MD5 046bc2cb149b10af2e01826bcaa8ad61
SHA1 ccd7f873c73acbb15b5f8b0aff6b30a448775586
SHA256 254c6f2c1818f1f6cea13d8596ce8650c594c7a2b311274a3beae437fadcf0b5
CRC32 0268fb3b
Example file location C:\Windows\System32\