HOW TO DELETE WINDOWS OLD FOLDER IN WINDOWS:Windows. Old folder is a folder in system partition (usually C: drive) that contains previous Windows installation, program files and all the data of Users. It is processed after you upgrade your Windows operating system to a new one.


If something is not right or you just cannot get used to the new operating system (OS), you can use the Windows. Old folder to downgrade Windows 10. While using the new system, you might find out that there are some of your personal files that are not copied to the corresponding folder. With this folder, you can move your files from C:\Windows.old to the equivalent location. This is a great move of Microsoft because it gives you an extra layer of protection while reinstalling Windows.

Warning: Windows will automatically delete the Windows. Old in Windows 10 after the upgrade for a month. If you want to keep it much longer, you can back up it in advance.

When you upgrade your Windows OS, the system automatically creates a folder that contains all the files and folders from your previous OS. This folder is aptly named Windows.old. This system folder can hog a ton of space and may be contributing to the lackluster performance of your computer. If this is the case, we suggest that you delete it. Here’s how to delete Windows.Old folder:

  1. In the search box on the taskbar, type settings, then choose it from the list of results.
  2. Select System > Storage > This PC and then scroll down the list and choose Temporary files.
  3. Under Remove temporary files, select the Previous version of Windows check box and then choose Remove files.


  1. Go to the Windows search bar. This is the magnifying glass icon on the left side of your taskbar, next to the windows logo.
  2. Type Cleanup.
  3. Launch the Disk Cleanup app.
  4. Click the “Clean up system files” button. The system will generate files that you can clean up and their corresponding sizes.
  5. If you have multiple drives, select the (C:) drive. You will only have this option if you have more than one drive on your computer.
  6. Check the box for “Previous Windows Installation(s).” 
  7. Click OK to delete.

How do I force delete Windows old folder?

Right-click the drive with Windows installation and click Properties. Click Disk Cleanup and select Clean up the system. Select the Previous Windows Installation(s) option to delete Windows. old folder.

Deleting Windows.old

old folder will contain all the application/files which were installed in your previous Operating system. So, by deleting Windows. old folder, all the applications and files which were there in your old operating system will get deleted.

Is Windows.old folder important?

old folder is where the old system files store after upgrading your copy of Windows 10’s version. This folder is important when you decide to roll back to the previous version but it will be automatically deleted after 10 days. If you’re already satisfied with your recent upgrade, then you can definitely delete it.

Why does my PC have Windows old?

Windows. old is a backup of the system you just updated in case something goes wrong with the upgrade. If you find the new system doesn’t work or you don’t like the state of things after it’s complete, you can just roll it back using Windows 10’s built in roll back feature