How to Fix 0x8007003B Error When Copying Files in Windows 10 or 11
If you’re seeing the 0x8007003B error while copying files from your Windows 10 or 11 computer to another device or network drive, don’t worry — it’s a fairly common issue. This error usually pops up when something interrupts the file transfer, such as disk format limits, antivirus blocks, network issues, or damaged system files.
Let’s go through a few simple ways to fix it.
1. Check the Drive Format
If the file you’re trying to copy is larger than 4 GB, make sure your target drive isn’t using the FAT32 format. FAT32 doesn’t support files over 4 GB, which causes the transfer to fail.
How to check your drive format:
- Open This PC from File Explorer.
- Right-click the drive and choose Properties.
- Look for the File System line — if it says FAT32, that’s the problem.
You have two options:
- Compress the file using a tool like 7-Zip to make it smaller.
- Reformat the drive to NTFS (this will erase everything on it, so back up first).
To reformat:
- In This PC, right-click the drive → Format.
- Choose NTFS under File System.
- Check Quick Format and click Start.
Once done, try the transfer again.
2. Scan and Repair the Disk
Sometimes the issue comes from errors on the drive itself. You can use Windows’ built-in disk check tool to find and fix these problems.
Steps:
- Open This PC, right-click the drive, and choose Properties.
- Go to the Tools tab.
- Under Error checking, click Check → Scan and repair drive.
This will automatically repair common file system errors that may cause the transfer to fail.
3. Turn Off Antivirus and Firewall (Temporarily)
Your antivirus or Windows Defender Firewall might mistakenly block the file transfer. You can turn them off for a short while to test if that’s the cause.
To disable Windows Defender Firewall:
- Open Windows Security from the Start menu.
- Go to Firewall & network protection.
- Choose the active network and switch Microsoft Defender Firewall off.
To turn it back on, repeat the steps and re-enable the toggle.
If you use third-party antivirus software, temporarily pause it while transferring the file, then turn it back on afterward.
4. Run a System File Check
Corrupted Windows system files can also trigger the 0x8007003B error. Running a System File Checker (SFC) scan can help repair them.
Here’s how:
- Right-click the Start menu and select Terminal (Admin) or Command Prompt (Admin).
- Type the following commands one by one, pressing Enter after each:
DISM.exe /Online /Cleanup-image /Restorehealth
sfc /scannow - Wait for the process to complete and restart your computer.
This will repair or replace damaged system files that may be interfering with file transfers.
5. Reset Network Settings
If the error appears while transferring files over a network (like to a NAS or another PC), try resetting your Windows networking components.
Open Command Prompt (Admin) and run these commands one by one:
netsh winsock reset
netsh int ip reset
ipconfig /release
ipconfig /renew
ipconfig /flushdns
Restart your computer afterward and try again.
6. Use System Restore
If the issue started recently after installing new software or changing system settings, you can roll Windows back to a working state using System Restore.
How to do it:
- Search for Create a restore point and open it.
- In the System Protection tab, click System Restore.
- Click Next, then choose a restore point created before the problem started.
- Follow the prompts to complete the process.
This will revert your system files and settings to a previous state without affecting your personal data.
Conclusion
The 0x8007003B error can appear for many reasons — from file size limits and corrupted system files to antivirus interference or bad sectors on a drive. The good news is that it’s almost always fixable with a few simple checks.
Start with the drive format and disk check, then move to the network, antivirus, or system file fixes. Once the issue is resolved, you should be able to copy your files normally again without any interruptions.
