aspnet_isapi.dll - Repair Issues and Download

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

aspnet_isapi.dll file Dynamic Link Library. The file was developed by Microsoft for use with Windows software. Here you will find detailed information about the file and instructions how to proceed in the event of aspnet_isapi.dll related errors on your device. You can also download aspnet_isapi.dll file compatible with Windows 10, Windows 8.1, Windows 8, Windows 7, Windows 7, Windows Vista, 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 7, Windows Vista, Windows Vista

File info

General information
Filename aspnet_isapi.dll
File extension DLL
Type Dynamic Link Library
Description Dynamic Link Library
Program Windows 10
Software Windows
Author Microsoft
Software version 10
File size 25776
Oldest file 2008-01-21
Latest file 2017-03-18

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

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



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


Problems related to aspnet_isapi.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 aspnet_isapi.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.

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

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

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

  • Windows 10: C:\Windows\Microsoft.NET\Framework\v4.0.30319\
  • Windows 8.1: C:\Windows\Microsoft.NET\Framework\v4.0.30319\
  • Windows 8: 1: C:\Windows\Microsoft.NET\Framework\v4.0.30319\
  • Windows 7: C:\Windows\Microsoft.NET\Framework\v2.0.50727\
  • Windows 7: C:\Windows\Microsoft.NET\Framework\v2.0.50727\
  • Windows Vista: ---
  • Windows Vista: ---

If the steps did not solve your aspnet_isapi.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 aspnet_isapi.dll
System Windows 10
File size 25776 bytes
Date -0001-11-30
File details
MD5 1949e70e18d427af0ec6ba2b43b95daa
SHA1 c8850dd03eceda98ccf10ac4e59cd5e5a2483595
SHA256 feca10c4ca2495ee2ddb5b3b713db1fc6df67781a0c069ae5851bcb55decfc18
CRC32 3c460fc2
Example file location C:\Windows\Microsoft.NET\Framework\v4.0.30319\
Filename aspnet_isapi.dll
System Windows 8.1
File size 24672 bytes
Date -0001-11-30
File details
MD5 40f21e8d35e7dfe103b6591ab0f1a4d5
SHA1 23e30764db6bd66c288be7bb617e0860adbebb95
SHA256 a801bbf68284537eca5dce6bf86867c115867776b7685174769bd0193b07a7fc
CRC32 d0da9e9a
Example file location C:\Windows\Microsoft.NET\Framework\v4.0.30319\
Filename aspnet_isapi.dll
System Windows 8
File size 24512 bytes
Date -0001-11-30
File details
MD5 7fc196f945f1130294ea9c20c8c69dc0
SHA1 c1a6e71598fef382acf0f36d8ec9514289180e7f
SHA256 ee9a412770c41d8a73f05684142ad7a0c5cbe366b41554f4058fe2d38d8aae8a
CRC32 0c014651
Example file location 1: C:\Windows\Microsoft.NET\Framework\v4.0.30319\
Filename aspnet_isapi.dll
System Windows 7
File size 14168 bytes
Date -0001-11-30
File details
MD5 470f965aee23fe3462db9529b892b4e4
SHA1 3c3cef1458995fccc24b1b5fab1f7f09b4251062
SHA256 b026f3ac02bcbfe45c55f53152e1cd7781478bcd89e23c0701470538f4688025
CRC32 9a73bc7d
Example file location C:\Windows\Microsoft.NET\Framework\v2.0.50727\
Filename aspnet_isapi.dll
System Windows 7
File size 16200 bytes
Date -0001-11-30
File details
MD5 dc4670a0d78a033ee33633b1022268a1
SHA1 8635bb1a41a7081fb9873ca833871b6664565bfe
SHA256 95c4409946d5aefab4fdfe8b849b653406644ffcb267d6b7d6ca68e8dd557f78
CRC32 d42502b6
Example file location C:\Windows\Microsoft.NET\Framework\v2.0.50727\
Filename aspnet_isapi.dll
System Windows Vista
File size 19464 bytes
Date -0001-11-30
File details
MD5 0c9905151f5b58a976b7eea8001ecff4
SHA1 0425e3589123d43a0b4d7276dc32b60efffd283b
SHA256 122d8d45474f05d9081f588b4921b31c64dfbf85219e2bd8926fa6610c392eb7
CRC32 2c21668d
Example file location ---
Filename aspnet_isapi.dll
System Windows Vista
File size 14168 bytes
Date -0001-11-30
File details
MD5 230c67c60247b2eaa117c230ef7a216c
SHA1 2bec53c7f01ff6e453e615153008bcbd8471e914
SHA256 9e2f2b261352c9ad80867e4510d59da597dca8ce9445b28e2db235671451c674
CRC32 ecc8168d
Example file location ---