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Error 87, which states “The parameter is incorrect,” is a common issue encountered on Windows 11. This error often appears when running commands in Command Prompt or PowerShell, especially when managing disks, drivers, or network settings. It can be confusing for users who are not familiar with system commands or troubleshooting steps.

Fortunately, fixing this error is usually straightforward if you follow the right steps carefully. This guide will walk you through simple methods to resolve Error 87 on Windows 11.

Each step is explained in detail, even for beginners, so you can understand why it matters and how to do it correctly. Let’s get started and get your system running smoothly again.

By the end, you will have several options to try, plus answers to common questions and advice if nothing seems to work.

Quick Note: Before You Begin

• Check Command Syntax: Error 87 often occurs due to typing mistakes in commands. Always double-check your command spelling and parameters.
• Run as Administrator: Many commands require elevated permissions. Right-click Command Prompt or PowerShell and select “Run as administrator.”
• Windows Updates: Ensure your Windows 11 is up-to-date as some errors get fixed via updates.
• Backup Your Data: When working with disk or system commands, it’s good practice to backup important files to avoid accidental data loss.

Step 1: Verify and Correct Command Syntax

The most common cause of Error 87 is incorrect command syntax. Even a small typo or missing space can cause this error. For example, if you are trying to use the diskpart command to manage disks, the command must be exactly right.

How to check:

1. Open Command Prompt as administrator.
2. Type your command carefully. For example, to list disks, type: diskpart and then list disk.
3. If you get Error 87, review the command for spelling, spaces, and correct parameters.

Why this matters: Windows commands have strict syntax rules. Incorrect parameters or missing switches lead to errors. Checking syntax first saves time.

Step 2: Run Command Prompt or PowerShell as Administrator

Some commands require administrator privileges to execute properly. Running the terminal without these rights may cause Error 87 or similar issues.

How to do it:

1. Click the Start button or press the Windows key.
2. Type Command Prompt or PowerShell.
3. Right-click the app icon and select Run as administrator.
4. Try your command again.

Why this matters: Without admin rights, Windows restricts access to critical system functions, which may cause commands to fail or return errors.

Step 3: Use the Correct Command for Your Task

Sometimes users mix commands or use the wrong tool for a specific job, resulting in Error 87.

Example: Trying to use netsh commands with invalid parameters or using diskpart commands incorrectly.

How to proceed:

• Identify what you want to achieve (e.g., format a disk, reset network settings).
• Look up the correct command syntax on Microsoft’s official documentation or trusted tech sites.
• Apply the exact command with proper parameters.

Why this matters: Using the right command ensures Windows understands your request and can execute it without errors.

Step 4: Check for Corrupted System Files

Corrupted or missing system files can cause commands to fail and display Error 87. Running built-in repair tools can fix these problems.

Steps to run System File Checker (SFC):

1. Open Command Prompt as administrator.
2. Type sfc /scannow and press Enter.
3. Wait for the scan to complete. It may take some time.
4. If issues are found, the tool will attempt repairs automatically.
5. Restart your computer and try your command again.

Why this matters: System files are crucial for Windows to run commands properly. Fixing corrupted files can resolve many unexpected errors.

Step 5: Update or Reinstall Device Drivers

If Error 87 appears when working with hardware-related commands, outdated or faulty drivers could be the cause.

How to update drivers:

1. Press Windows + X and select Device Manager.
2. Find the device related to your task (for example, network adapters or disk drives).
3. Right-click the device and select Update driver.
4. Choose Search automatically for drivers.
5. Follow the prompts and restart your PC if needed.

Alternative: You can also visit the manufacturer’s website and download the latest drivers manually.

Why this matters: Correct and updated drivers ensure hardware communicates properly with Windows commands.

Step 6: Use Alternative Tools or Commands

If the error persists, consider using alternative Windows tools or graphical interfaces to achieve your goal.

• Disk Management: Instead of command-line disk commands, use the Disk Management utility by pressing Windows + X and selecting Disk Management.
• Network Troubleshooter: For network-related errors, run Windows Troubleshooter by going to Settings > System > Troubleshoot > Other troubleshooters.
• PowerShell: Some commands work better or differently in PowerShell. Try running your commands there.

Why this matters: Sometimes GUI tools bypass issues caused by command-line syntax or permissions.

FAQs

What does Error 87 mean in Windows 11?

It means “The parameter is incorrect.” This usually indicates that a command or function received an invalid or unexpected parameter.

Can I fix Error 87 without technical knowledge?

Yes. Simple steps like running Command Prompt as administrator or checking command syntax can solve most cases.

Is Error 87 related to hardware problems?

Not usually, but outdated or corrupt drivers can cause this error when running hardware-related commands.

Does updating Windows help fix Error 87?

Yes, keeping Windows updated ensures bugs and compatibility issues are fixed, which may resolve Error 87.

What if I still get Error 87 after trying all steps?

It might indicate deeper system issues or incorrect commands. Seeking expert help or reinstalling Windows may be necessary.

When Nothing Works

If you have tried all the steps above and still encounter Error 87, consider the following options:

• Use Microsoft’s Official Support: Visit the Microsoft Support website for specific help related to your error.
• Perform a System Restore: Restore your PC to a previous point when everything was working fine. Search for “Create a restore point” in Windows, then use System Restore.
• Reset or Reinstall Windows: As a last resort, resetting Windows or doing a clean installation may fix persistent errors.
• Ask in Tech Forums: Communities like Microsoft Answers or Reddit can provide personalized help.

Conclusion

Error 87 “The parameter is incorrect” on Windows 11 can be caused by simple issues like wrong command syntax or lack of administrator rights. By carefully checking your commands, running the terminal as an administrator, and ensuring your system files and drivers are healthy, you can resolve most instances of this error.

Using alternative tools and knowing when to seek advanced help is important to avoid frustration. Keep your system updated and always back up important data before making major changes.

With these steps, you should be able to fix Error 87 efficiently and get your Windows 11 device working properly again.