Fix dldtTwPro.dll is missing/ not found error Step by Step

Frustrated by the dldtTwPro.dll error message? Well, you should want to know what this dldtTwPro.dll file is, what causes this error and the most important thing is how to fix this error. In this page, you will find all answers to your questions about this dldtTwPro.dll and the methods to fix it.

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What's dldtTwPro.dll File?

As its file extension denotes, dldtTwPro.dll is a vital DLL file and it's a component of the software Twain Protocol developed by Windows Software Developer. The latest version of dldtTwPro.dll file is 12.0 and MD5 value is bdfd975767b1a183020609b798dee73e. Twain Protocol and the Windows will generate dldtTwPro.dll error when dldtTwPro.dll file cannot be used due to the removal or corruption of dldtTwPro.dll file. This error can be seen on Windows XP, Windows Vista, Windows 7, Windows 8 and Windows 10.

dldtTwPro.dll file information:
File Name:   
   dldtTwPro.dll (Free Scan)
File Description:   
   Twain Protocol
Product Name:   
   Twain Protocol
Product Version:   
   Windows Software Developer
File md5:   
File type:   
   dll file
Security Level(0-5):   
OS Infected:   
   Download dldtTwPro.dll Error Free Scan Tool

Why Do I Receive dldtTwPro.dll Error?

Dynamic Link Libraries (also called as DLL) are similar to EXE files, though they are not directly executable. A DLL is a library which contains code and data which can be used by many programs simultaneously. To reduce disk space and speed up the performance, not all DLL files are loaded with Windows. When a program needs a DLL, that file will be loaded and run.

For example, most computer programs needs to create the graphical interface which appears on the screen. So when they need to create the interface, they just call on a DLL for that functionality rather than having to contain the code in the program. So, when dldtTwPro.dll file is not correctly loaded and run, the program and the Windows will pop up error messages.

Popular dldtTwPro.dll Error Messages

  • The application has failed to start because dldtTwPro.dll was not found. Re-installing the application may fix this problem.
  • The program can't start because dldtTwPro.dll is missing from your computer. Try reinstalling the program to fix this problem.
  • dldtTwPro.dll failed. The specified module could not be found.
  • File not found: dldtTwPro.dll.
  • Failed to load library 'dldtTwPro.dll'.
  • Access violation in module 'dldtTwPro.dll'.
  • Component 'dldtTwPro.dll' or one of its dependencies not correctly registered a file is missing or invalid.

You may receive dldtTwPro.dll error when you run or close Twain Protocol, start or shut down the computer, or use specific function of Twain Protocol. The time you encounter the error is very important to troubleshoot the problem.

Causes of dldtTwPro.dll Error

dldtTwPro.dll error can be caused by plenty of reasons. The following are the most common causes of dldtTwPro.dll error.

  • The latest version of dldtTwPro.dll file is overwritten by a previous version installed by another newly-installed program.
  • There is a malfunctioning or faulty hardware in your computer.
  • dldtTwPro.dll file is infected with malicious adware, Trojans, spyware and malware.
  • The associated entries of dldtTwPro.dll are corrupted in the registry.
  • dldtTwPro.dll file that is still used by other programs is uninstalled by another program.

How to Fix dldtTwPro.dll Error?

Keep in mind, never download DLL files from DLL download websites, because they are not verified by their developers and may contain malicious code which lead to further damage to your computer system. We have listed several solutions to troubleshoot your dldtTwPro.dll problem.

Method 1: Manually register dldtTwPro.dll file.

When a program uses a DLL function in another DLL, a dependency is created. As a result, the program is no longer dependent, and it may have problems if the dependency with the DLL is broken or corrupted. To fix such error, we can use re-register dldtTwPro.dll file.


a. Open an elevated command prompt.

Windows Vista and Windows 7

Click Start, click All Programs, Accessories, and then right click Command Prompt and click Run as administrator.

command prompt windows 7

Windows 8, Windows 8.1 and Windows 10

Open Win X menu by holding Windows and X keys, and then click Command Prompt (Admin).

windows8 win x menu

b. After confirming the UAC prompt, type regsvr32 /u dldtTwPro.dll in the Command Prompt and hit Enter. This will un-register dldtTwPro.dll file.

c. Then type regsvr32 /i dldtTwPro.dll in the Command Prompt and hit Enter. This will re-register dldtTwPro.dll file.

d. Restart your software to see if the error is fixed.

Method 2: Uninstall and then reinstall Twain Protocol causing dldtTwPro.dll error.

If dldtTwPro.dll error pops up when you're using Twain Protocol, then it's worth trying to reinstall Twain Protocol or the program from Windows Software Developer.


Windows Vista, Windows 7 and Windows 10:

a. Click Start and click Control Panel.

start control panel windows 7

b. Click Uninstall a program.

win7 control panel programs and features

c. Look for Twain Protocol or the program from Windows Software Developer, right click on it and click Uninstall to uninstall it from your system.

uninstall software

d. After the uninstallation, restart your computer and then reinstall the software with your disc or the installer from the official website.

Windows 8 and 8.1:

a. Hover the cursor to the top right corner of the screen to bring up Charms bar and then click Search.

windows 8 charms bar search

b. Click Settings, type uninstall, and click Uninstall a program in the search results.

uninstall windows8

c. Look for Twain Protocol or the program from Windows Software Developer, right click on it and click Uninstall to uninstall it from your system.

uninstall software windows8

d. After the uninstallation, restart your computer and then reinstall the software with your disc or the installer from the official website.

Method 3: Run a virus scan.

Malware infection is one of the most popular cause of various computer problems like dldtTwPro.dll error. Computer malware can make their way into the system, change system settings and corrupt system files. When this happens, Twain Protocol and Windows becomes more prone to dldtTwPro.dll error and even malfunction.


a. Restart your system into Safe Mode with Networking.

b. Open your antivirus or antispyware program. (You can also use this recommended malware detect tool)

c. Run a full scan for your system.

d. After the scan completes, either quarantine or remove any detected malware.

e. Restart your system.

Method 4: Look for deleted dldtTwPro.dll file.

When Twain Protocol and the Windows cannot find dldtTwPro.dll file, it will tell you that dldtTwPro.dll is missing or not found. As a result, try your luck to see if dldtTwPro.dll is in the Recycle Bin.


a. Double click on the Recycle Bin icon on your desktop to open it.

b. Search thru all deleted files there and look for the dldtTwPro.dll file.

c. If it's found, then right click on it and click Restore.

restore file

What can you do if the Recycle Bin has been emptied? Try to use a file recovery tool to help you recover the file.

Method 5: Update device drivers.

Many issues, conflicts and vulnerabilities of device drivers may result in unexpected problems like dldtTwPro.dll error. Drivers are software that enables Windows system to talk and give instructions to hardware devices. Though drivers work correctly one day, they may have problems the next day. Keeping your drivers updated is a way to keep your system error-free.

Method 6: Repair corrupted Windows registry.

As the most important part of Windows operating system, Windows registry is a place that stores all information and configurations of software and hardware. A problematic registry is one of the most common causes of computer errors like dldtTwPro.dll error. Software installation, uninstallation, malware infection can make changes to the registry. Over time, more and more invalid entries are left and accumulated in the registry and then lead to various errors and problems. The registry needs regular maintenance to keep it tidy and stable. Manual editing the registry is not practical for people with no computer expertise, it's recommended that you use a registry cleaner to do this job.


Note: It requires certain computer knowledge to perform the above solutions. If you're not comfortable with this process, it's recommended that you download and run this automatic error fix utility to fix your PC problems automatically:

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Does dldtTwPro.dll error still persist?

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