Windows 10 Media Creation Tool Error 0x80042405: Making a Bootable USB That Actually Works
You run Microsoft’s Media Creation Tool to make a Windows 10 installation USB, and it stops with “There was a problem running this tool.” The Windows 10 Media Creation Tool error 0x80042405 is usually YYPAUS followed by a second code, such as 0xA001A.
The tool downloads Windows and writes it to a USB drive. This particular error appears when it cannot prepare or write to that drive.
The fix is usually simple and often involves where the tool itself is being run from.
What Usually Triggers It
The tool fails for these reasons:
- The Media Creation Tool is being run from the same USB drive it is trying to write to.
- The USB drive is damaged, too small, or formatted in an unsuitable way.
- Security software is blocking the tool from writing to the drive.
- The PC is short of free space for the download.
Running the tool directly from a flash drive is the classic cause of the 0xA001A variant.
First Steps to Try
Fix the basics.
- Copy MediaCreationTool.exe to your Desktop or Downloads folder on drive C.
- Right-click it there and choose “Run as administrator.”
- Use a USB drive of at least 8 GB that holds nothing you need, since it will be erased.
- Make sure drive C has 10 GB or more free for the download.
- Disconnect other USB drives so you do not select the wrong one.
Running the tool from the local disk solves many cases straight away.
If the Problem Continues
Prepare the USB drive and try again.
- Open Disk Management, right-click the USB drive’s partition, and choose Delete Volume, then create a new simple volume formatted as NTFS.
- Alternatively, choose “ISO file” in the Media Creation Tool to download an ISO first.
- Then use a reputable USB creation tool, or right-click the ISO, choose Mount, and copy the files manually if you only need them for a repair install.
- Temporarily disable third-party antivirus while the tool runs.
- Try a different USB port and a different flash drive.
Cheap or old flash drives often fail during the long write process, so using a different drive is a good test.
Protect Your Data First
Everything on the USB drive is deleted during creation, so check its contents first. In Disk Management, be completely sure you have selected the USB drive and not an internal disk. Download the Media Creation Tool only from Microsoft’s official website.
The Bottom Line
Error 0x80042405 usually means the tool could not write to the USB drive it was given. Run the tool from drive C, use a healthy USB stick, and fall back to downloading an ISO if needed.
Keep the finished USB drive somewhere safe, since it doubles as a repair disk for startup problems as well as an installer.