---
title: "Solution: “We Couldn't Install Windows” – Installation Failed at Setup"
description: "This setup error can appear at different stages of the installation process. Sometimes it shows a code such as 0x8007025D or 0x8007000D, and other times it appears without any code at all. The good news is that this is a very common issue and it’s usually resolved with a few practical steps."
url: https://help.activekeys.com/en/articles/45-solution-we-couldn-t-install-windows-installation-failed-at-setup
collection: "Windows Troubleshooting"
updated: 2026-02-12
language: en
---

# Solution: “We Couldn't Install Windows” – Installation Failed at Setup

This setup error can appear at different stages of the installation process. Sometimes it shows a code such as 0x8007025D or 0x8007000D, and other times it appears without any code at all. The good news is that this is a very common issue and it’s usually resolved with a few practical steps.

**🔍 What typically causes this message**

This problem often occurs when:

-   The Windows installation files are incomplete or corrupted
    
-   The USB installer (or ISO image) wasn’t created properly, or the USB drive has issues
    
-   The drive contains conflicting partition data or an inconsistent partition table
    
-   The device doesn’t meet basic hardware requirements or has unstable components
    

**✅ How to fix it**

1.  Recreate the bootable USB (best first step)  
    This resolves most cases.
    

Download Microsoft’s installation tool and create a brand-new installer USB (use an **8 GB+** USB drive). If possible, try a different USB drive than the one you used previously.

Windows 10 download page:  
[https://www.microsoft.com/software-download/windows10](https://www.microsoft.com/software-download/windows10)  
(Use the Windows 11 page if you’re installing Windows 11.)

For better compatibility, connect the USB directly to the PC and prefer a **USB 2.0 port** when available.

2.  Disconnect other USB devices  
    Unplug anything not required for the install, such as printers, external storage, hubs, or dongles. Extra devices can confuse Setup or interrupt the process.
    
3.  Delete existing partitions during setup (clean install method)  
    When you reach the drive selection screen:
    

Choose **Custom: Install Windows only (advanced)**  
Delete the existing partitions on the target drive (only if your files are backed up)  
Select the **unallocated space** and click **Next**

Windows will recreate the required partitions automatically.

4.  Optional: Run a memory test  
    Unstable or faulty RAM can cause installation failures.
    

Press **Windows + R**, type **mdsched.exe**, then run the Windows Memory Diagnostic and follow the prompts.