Fix Dcomp.dll Missing Errors, Authorization Problems, and Faulting Mode Issues

Step 1: Move the dcomp.dll File Manually

When confronted with a missing or incompatible dcomp.dll file, your first action should be to transfer a fresh copy manually. You can find the dcomp.dll file located in C:\Windows\System32 .

To do this, access another computer with the same version and architecture of Windows. Copy the dcomp.dll file onto a USB flash drive. Plug the drive into the affected computer, move the dcomp.dll to the System32 directory, and restart your computer. This should eliminate the missing DLL error.

Pro Tip: Ensure both computers run the same Windows version and architecture (32-bit or 64-bit) to prevent incompatibility.

Step 2: Run the Program as Administrator

1. Right-click the program’s executable file (.exe) and select Properties.
2. Navigate to the Compatibility tab, and check the box that says Run this program as an administrator.
3. Click Apply followed by OK to save changes.
4. Restart the application and check if the problem persists.

Running programs with administrative privileges can significantly reduce the chances of encountering the dcomp.dll error in applications such as Microsoft Excel, Word, or Outlook.

Step 3: Repair Corrupted System Files

1. Press Windows + R to launch the Run dialog, input cmd, and hit Ctrl + Shift + Enter.
2. Confirm the action by clicking Yes in the User Account Control prompt.
3. Sequentially enter these commands, pressing Enter after each: DISM /Online /Cleanup-Image /CheckHealth , DISM /Online /Cleanup-Image /ScanHealth , DISM /Online /Cleanup-Image /RestoreHealth .
4. Finally, execute a System File Checker (SFC) scan with: sfc /scannow .
5. Restart your computer to complete the process.

Repairing damaged system files may restore the dcomp.dll file from a cached version. This procedure is especially useful for resolving missing DLL file errors.

Step 4: Conduct a Malware Scan

1. Open the Search feature with Windows + S, type Windows Security, and select it.
2. Click on Virus & Threat Protection.
3. Choose Scan Options.
4. Opt for the Full Scan option and click Scan Now.
5. Allow the scan to finish, which may take between 15 to 30 minutes.

Malware infections can corrupt system files, including dcomp.dll. Regularly scanning for malware is crucial for system health.

Step 5: Reinstall the Problematic Application

1. Press Windows + R, type appwiz.cpl, and hit Enter.
2. Find the application in the list, select it, and click Uninstall.
3. Follow the on-screen prompts to complete uninstallation, then restart your computer.
4. Reinstall the application from an official source to resolve the dcomp.dll issue.

Step 6: Perform an In-Place Upgrade

1. Go to Microsoft’s official website, select the appropriate OS edition and language, and download the Windows 11 ISO.
2. Open the ISO file and hit Open in the confirmation dialogue.
3. Run the setup.exe file.
4. Click Yes in the UAC prompt.
5. Select Next to proceed.
6. Accept the terms of Microsoft’s software license by clicking Accept.
7. Make sure to keep personal files and apps selected, click Install, and confirm.
8. Wait for the upgrade process to complete, which can take between 30 to 90 minutes.

Executing an in-place upgrade can resolve the missing dcomp.dll error while retaining your existing files and applications. If this fails, a full Windows reinstallation can ensure complete functionality.

What is dcomp.dll?

Can I download dcomp.dll from third-party websites?

What should I do if all else fails?