PyISAPI_loader.dll: How to Fix DLL Errors, Download, and Update

Last Updated: 05/04/2020
[Time Needed for Reading: ~4-6 minutes]

PyISAPI_loader.dll, also known as a Dynamic Link Library file, was created by Kovid Goyal for the development of Calibre 4.2.0. DLL files fall under under the Win32 DLL (Dynamic Link Library) file type category.

PyISAPI_loader.dll was initially released with Calibre 4.2.0 on 10/18/2019 for the Windows 10 Operating System. This is not only most recent release from Kovid Goyal, but it's the only version known in existence.

In this article, you will find detailed PyISAPI_loader.dll information, a DLL file troubleshooting guide, and a list of versions that are available for free download.

File Analysis Provided by Jason Geater (Author)


Recommended Download: Fix PyISAPI_loader.dll / Calibre-related registry issues with WinThruster.

Compatible with Windows 10, 8, 7, Vista, XP and 2000

Average User Rating

 

Optional Offer for WinThruster by Solvusoft
| EULA | Privacy Policy | Terms | Uninstall


File Overview


General Information
File Name: PyISAPI_loader.dll
File Extension: DLL file extension
File Type: Dynamic Link Library
Description: Dynamic Link Library
MIME Type: application/octet-stream
User Popularity Rating:
 
Developer and Software Information
Software Program: Calibre 4.2.0
Developer: Kovid Goyal
Software: Calibre
Software Version: 4.2.0
File Details
Entry Point: 0x74fa
Code Size: 29696


What are PyISAPI_loader.dll Error Messages?


Dynamic Link Library PyISAPI_loader.dll Errors

PyISAPI_loader.dll is considered a type of Dynamic Link Library (DLL) file. Dynamic Link Library files, like PyISAPI_loader.dll, are essentially a "guide book" that stores information and instructions for executable (EXE) files - like MpSigStub.exe - to follow. These files were created so that multiple programs (eg. Calibre) could share the same PyISAPI_loader.dll file, saving valuable memory allocation, therefore making your computer run more efficiently.

Unfortunately, what makes DLL files so convenient and efficient, also makes them extremely vulnerable to problems. If something happens to a shared DLL file, either it goes missing or gets corrupted in some way, it can generate a "runtime" error message. Runtime is pretty self-explanatory; it means that these errors are triggered when PyISAPI_loader.dll is attempted to be loaded either when Calibre is starting up, or in some cases already running. Some of the most common PyISAPI_loader.dll errors include:

Your PyISAPI_loader.dll file could be missing due to accidental deletion, uninstalled as a shared file of another program (shared with Calibre), or deleted by a malware infection. Furthermore, PyISAPI_loader.dll file corruption could be caused from a power outage when loading Calibre, system crash while loading PyISAPI_loader.dll, bad sectors on your storage media (usually your primary hard drive), or quite commonly, a malware infection. Thus, it's critical to make sure your anti-virus is kept up-to-date and scanning regularly.



How to Fix PyISAPI_loader.dll Errors in 3 Steps (Time to complete: ~5-15 minutes)

If you're encountering one of the error messages above, follow these troubleshooting steps to resolve your PyISAPI_loader.dll issue. These troubleshooting steps are listed in the recommended order of execution.


Step 1: Restore your PC back to the latest restore point, "snapshot", or backup image before error occurred.

To begin System Restore (Windows XP, Vista, 7, 8, and 10):

  1. Hit the Windows Start button
  2. When you see the search box, type "System Restore" and press "ENTER".
  3. In the search results, find and click System Restore.
  4. Please enter the administrator password (if applicable / prompted).
  5. Follow the steps in the System Restore Wizard to choose a relevant restore point.
  6. Restore your computer to that backup image.

If the Step 1 fails to resolve the PyISAPI_loader.dll error, please proceed to the Step 2 below.

Step 2: If recently installed Calibre (or related software), uninstall then try reinstalling Calibre software.

You can uninstall Calibre software by following these instructions (Windows XP, Vista, 7, 8, and 10):

  1. Hit the Windows Start button
  2. In the search box, type "Uninstall" and press "ENTER".
  3. In the search results, find and click "Add or Remove Programs"
  4. Find the entry for Calibre 4.2.0 and click "Uninstall"
  5. Follow the prompts for uninstallation.

After the software has been fully uninstalled, restart your PC and reinstall Calibre software.

If this Step 2 fails as well, please proceed to the Step 3 below.

Calibre 4.2.0

Kovid Goyal

Step 3: Perform a Windows Update.

When the first two steps haven't solved your issue, it might be a good idea to run Windows Update. Many PyISAPI_loader.dll error messages that are encountered can be contributed to an outdated Windows Operating System. To run Windows Update, please follow these easy steps:

  1. Hit the Windows Start button
  2. In the search box, type "Update" and press "ENTER".
  3. In the Windows Update dialog box, click "Check for Updates" (or similar button depending on your Windows version)
  4. If updates are available for download, click "Install Updates".
  5. After the update is completed, restart your PC.

If Windows Update failed to resolve the PyISAPI_loader.dll error message, please proceed to next step. Please note that this final step is recommended for advanced PC users only.



If Those Steps Fail: Download and Replace Your PyISAPI_loader.dll File (Caution: Advanced)

If none of the previous three troubleshooting steps have resolved your issue, you can try a more aggressive approach (Note: Not recommended for amateur PC users) by downloading and replacing your appropriate PyISAPI_loader.dll file version. We maintain a comprehensive database of 100% malware-free PyISAPI_loader.dll files for every applicable version of Calibre. Please follow the steps below to download and properly replace you file:

  1. Locate your Windows operating system version in the list of below "Download PyISAPI_loader.dll Files".
  2. Click the appropriate "Download Now" button and download your Windows file version.
  3. Copy this file to the appropriate Calibre folder location:
    Windows 10: C:\Program Files (x86)\Calibre2\app\bin\
  4. Restart your computer.

If this final step has failed and you're still encountering the error, you're only remaining option is to do a clean installation of Windows 10.


GEEK TIP : We must emphasize that reinstalling Windows will be a very time-consuming and advanced task to resolve PyISAPI_loader.dll problems. To avoid data loss, you must be sure that you have backed-up all of your important documents, pictures, software installers, and other personal data before beginning the process. If you are not currently backing up your data, you need to do so immediately.



Download PyISAPI_loader.dll Files (Malware-Tested 100% Clean)


CAUTION : We strongly advise against downloading and copying PyISAPI_loader.dll to your appropriate Windows system directory. Kovid Goyal typically does not release Calibre DLL files for download because they are bundled together inside of a software installer. The installer's task is to ensure that all correct verifications have been made before installing and placing PyISAPI_loader.dll and all other DLL files for Calibre. An incorrectly installed DLL file may create system instability and could cause your program or operating system to stop functioning altogether. Proceed with caution.

Windows 10


Files Related to PyISAPI_loader.dll


DLL Files Related to PyISAPI_loader.dll

File Name Description Software Program (Version) File Size (bytes) File Location
System.Data.ni.dll Dynamic Link Library Calibre 4.2.0 6658048 C:\Windows\assembly\NativeImages_v2.0.50727_32\...
api-ms-win-core-sysinf... ApiSet Stub DLL Microsoft® Windows® Operating System (10.0.17763.132) 20608 C:\Program Files (x86)\Calibre2\app\bin\
OneDriveTelemetryStabl... OneDriveTelemetry Stable DLL Microsoft OneDrive (19.192.0926.0012) 1343848 C:\Users\Tester\AppData\Local\Microsoft\OneDriv...
mscorlib.ni.dll Dynamic Link Library Calibre 4.2.0 11500544 C:\Windows\assembly\NativeImages_v2.0.50727_32\...
msvcp140.dll Microsoft® C Runtime Library Microsoft® Visual Studio® 2017 (14.16.27012.6) 441704 C:\Users\Tester\AppData\Local\Microsoft\OneDriv...

Other Files Related to PyISAPI_loader.dll

File Name Description Software Program (Version) File Size (bytes) File Location
CBS.log Log Calibre 4.2.0 888726 C:\Windows\Logs\CBS\
api-ms-win-core-heap-l... ApiSet Stub DLL Microsoft® Windows® Operating System (10.0.17763.132) 19584 C:\Program Files (x86)\Calibre2\app\bin\
diagerr.xml Extensible Markup Language Calibre 4.2.0 44109 C:\Windows\Panther\UnattendGC\
EtwRTEventLog-Applicat... Microsoft Event Trace Log Calibre 4.2.0 219792 C:\Windows\System32\LogFiles\WMI\RtBackup\
api-ms-win-core-debug-... ApiSet Stub DLL Microsoft® Windows® Operating System (10.0.17763.132) 19584 C:\Program Files (x86)\Calibre2\app\bin\


RocketPC

Optional Offer for WinThruster by Solvusoft | EULA | Privacy Policy | Terms | Uninstall


Browse Other File Extensions in Alphabetical Order :   # A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

You are downloading trial software. The purchase of a one-year software subscription at the price of $39.95 USD is required to unlock all software features. Subscription auto-renews at the end of the term (Learn more). By clicking the "Start Download" button above and installing "Software", I acknowledge I have read and agree to the Solvusoft End User License Agreement and Privacy Policy.