Fix: Fltlib.dll is Either Not Designed For Windows

Corrupted system files could be the reason

by Srishti Sisodia
Srishti Sisodia
Srishti Sisodia
Srishti Sisodia is an electronics engineer and writer with a passion for technology. She has extensive experience exploring the latest technological advancements and sharing her insights through informative... read more
Reviewed by Alex Serban
Alex Serban
Alex Serban
Windows Server & Networking Expert
After moving away from the corporate work-style, Alex has found rewards in a lifestyle of constant analysis, team coordination and pestering his colleagues. Holding an MCSA Windows Server... read more
Affiliate Disclosure
  • The reason behind this DLL error could be corrupted system files, malware infection, or pending Windows updates.
  • This guide will discuss the solutions to fix the missing dll file issue.
fltlib.dll is Either Not Designed For Windows
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If you have encountered fltlib.dll is either not designed for Windows error when the DLL file is not compatible with Windows installed on your PC. In this guide, we will discuss expert-tested ways to fix the error.

What causes the fltlib.dll is either not designed for Windows issue? 

There could be various reasons why you see this error; some of the common reasons are:

  • Malware infection – When your computer is infected with viruses or malware, it could cause the DLL to get corrupted. To remove the infection from your computer, you need to run a malware scan using a reliable antivirus tool.
  • Deleted accidentally – If you have uninstalled a program that used the dll file, it is possible that the file got deleted. Hence the error.
  • Bad sector on the hard drive – Bad sectors on the hard drive cause many issues; one such issue could be the DLL file missing.
  • The DLL file got corrupted – If the DLL file got corrupted or damaged, you might not be able to use the file. So, when you try to launch an app or game that uses the DLL file, you may get the error.

What can I do to fix the fltlib.dll is either not designed for Windows issue?

1. Run SFC and DISM command

  1. Press the Windows key, type CMD, and click Run as administrator.CMD elevated
  2. Type the following command to repair system files and press Enter: sfc/scannow
  3. Then, copy and paste the following commands one by one and press Enter after every command: DISM /Online /Cleanup-Image /CheckHealth DISM /Online /Cleanup-Image /ScanHealth DISM /Online /Cleanup-Image /RestoreHealthCMD DISM & SFC fltlib.dll is either not designed for Windows
  4. Once the command is executed successfully, restart your computer.

If the manual method mentioned above seems tedious, we recommend you try specialized software to perform this job.

A safe option for specialized software is Restoro, a tool designed to scan your device for corrupt or broken OS components and automatically search for healthy files from its online database as replacements.

2. Install Windows updates if pending

  1. Press Windows + I to open the Settings app.
  2. Go to Windows Update and click Check for updates.
  3. If available, click Download and install.Windows Update Check for updates - fltlib.dll is either not designed for Windows
  4. The update will be downloaded and installed in a few minutes. 
  5. You need to restart when prompted to complete the process.

3. Run a malware scan 

  1. Press the Windows key, type Windows Security, and click Open.Windows Security open
  2. Go to Virus & threat protection, and click Scan options.V& T fltlib.dll is either not designed for Windows
  3. Select Full scan and click Scan now.Full scan -
  4. Once the scan is complete, you need to remove the malicious files if found.

4. Run the computer in a clean boot environment

  1. Press Windows + R to open the Run console.MS CONFIG RUN COMMAND
  2. Type msconfig and click OK to open System Configuration.
  3. Go to the Services tab, place a checkmark next to Hide all Microsoft services, and click Disable all.Clean BOOT 2
  4. Next, switch to the Startup tab, and click Open Task Manager.CLEAN BOOT 3 fltlib.dll is either not designed for Windows
  5. Select all the Enabled items one by one and right-click Disable.Clean BOOT 4
  6. Click Apply and OK to save the changes.CLEAN BOOT 5

5. Perform  System Restore

  1. Press the Windows key, type Control Panel, and click Run as administrator.CP
  2. Select Category as View by and click Recovery.Recovery Control Panel fltlib.dll is either not designed for Windows
  3. Click Open System Restore.Open system restore
  4. On the next window, select Choose a different restore point and click Next.Next Choose a different restore point - fltlib.dll is either not designed for Windows
  5. Select the restore point and click Next.Choose a point
  6. Click Finish to initiate the process of restoring it to the previous version.Finish

6. Reinstall Windows on your computer

6.1 Create a bootable drive

  1. Go to the Microsoft Software Download website.
  2. Then, under Windows 11 Installation Media option, click Download Now.Download now Installation Now - fltlib.dll is either not designed for Windows
  3. Double-click the mediacreationtool.exe to open the Windows 11 Setup wizard.
  4. Click Accept.Accept the terms fltlib.dll is either not designed for Windows
  5. On the Select language and edition page and click Next.Windows 11 edition
  6. Choose which media to use and click Next.Setup 5 fltlib.dll is either not designed for Windows
  7. On the Select a USB flash drive window, click Next
  8. Then click Finish.USB drive ready

6.2  Install Windows

  1. Restart your computer. When your PC boots up, press F2, F10, or the designated key, depending on your device manufacturer. 
  2. In the BIOS, go to the Boot menu and Change the boot order. Select USB flash drive. Boot-order fltlib.dll is either not designed for Windows
  3. When prompted, press any key to continue booting.
  4. Select the language to install and other details on the setup window, then click Next.
  5. Click Install Now to start.Install now
  6. The following window will ask you to enter the product key. Please enter the product key, or you can click; I don’t have a product key option.
  7. On the next page, click Accept. Click Next.
  8. Now choose Custom: Install Windows only(advanced) for a clean installation.Setup 10
  9. Choose the unallocated space and click Next.
  10. The setup tool will install Windows OS. This might take several minutes; you must wait for the process to finish. 

So, these are the methods to fix the fltlib.dll is not designed for Windows issue. But try them and let us know what worked for you in the comments section below.

Still having issues? Fix them with this tool:


If the advices above haven't solved your issue, your PC may experience deeper Windows problems. We recommend downloading this PC Repair tool (rated Great on to easily address them. After installation, simply click the Start Scan button and then press on Repair All.

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