How to Delete the Windows.old Folder: A Comprehensive Guide
After a Windows update, you might notice a significant reduction in your disk space. This is often due to the presence of the 'Windows.old' folder, which contains the previous version of Windows. While it's useful for rollbacks, it can occupy a substantial amount of space. Here's a step-by-step guide on how to delete the Windows.old folder safely and reclaim your disk space.
Understanding the Windows.old Folder
Before we proceed, let's understand what the Windows.old folder is and why it's there. This folder contains the previous version of Windows, including your settings, apps, and data. It's created during a Windows update to provide an easy way to revert to the previous version if needed. However, it's safe to delete this folder once you're sure the update was successful and you don't need to roll back.
Checking Disk Space Before Deletion
Before you delete the Windows.old folder, it's a good idea to check how much space it's occupying. This can help you understand how much disk space you'll reclaim. Here's how:

- Press Win + E to open File Explorer.
- Navigate to the 'C:' drive (or the drive where Windows is installed).
- Look for the 'Windows.old' folder and right-click on it.
- Select 'Properties' from the context menu.
- In the 'Properties' window, you'll see the size of the folder under the 'Size on disk' section.
Deleting the Windows.old Folder: Method 1 - Command Prompt
Deleting the Windows.old folder directly from File Explorer isn't possible due to permissions. However, you can use the Command Prompt to delete it. Here's how:
- Press Win + X and select 'Command Prompt (Admin)' or 'Windows PowerShell (Admin)' from the menu.
- Type the following command and press Enter:
rd /s /q C:\Windows.old
- If you're asked for confirmation, type 'Y' and press Enter.
Deleting the Windows.old Folder: Method 2 - Disk Cleanup
If you're not comfortable using the Command Prompt, you can use the built-in Disk Cleanup tool to delete the Windows.old folder. Here's how:
- Press Win + R to open the Run dialog box.
- Type 'cleanmgr' and press Enter.
- In the 'Disk Cleanup' window, select the drive where Windows is installed (usually 'C:').
- Click 'OK'.
- In the 'Disk Cleanup' window, select 'Clean up system files'.
- Click 'OK'.
- In the 'More options' section, click on 'Clean up'.
- In the 'Disk Cleanup' window, select 'Previous Windows installation(s)' and click 'OK'.
- Click 'Delete files' to confirm.
Monitoring Disk Space After Deletion
After deleting the Windows.old folder, it's a good idea to monitor your disk space to ensure that the folder has been successfully deleted. You can do this by checking the size of the 'C:' drive in File Explorer or using the 'Storage' settings in Windows.

Remember, it's always a good idea to have a backup of your important data before performing any significant changes to your system. While deleting the Windows.old folder is safe, it's always better to be prepared.