Deleting the Windows.old folder can free up 10~20GB of space. It is recommended to use the disk cleaning tool: right-click the system disk → Properties → Disk Cleanup → Check "Previous Windows Installation" → Delete the file. If this option does not appear, you need to run the tool as an administrator; manually deletion requires turning off system protection and executing the command rd /s /q C:\Windows.old with administrator privileges. It is recommended to operate after upgrading for one week and back up the information in advance.
After the system is upgraded, Windows will keep the old system files in a folder called Windows.old , so that you can roll back. But if you are already sure you don't need to fallback, this folder can be deleted, freeing up several GB or even dozens of GB of space.

Use the Disk Cleanup Tool to delete Windows.old
This is the most recommended method, the system comes with it, safe and convenient.
Operation steps:

- Right-click on the system disk (usually a C disk) → select "Properties" → click "Disk Cleanup"
- Wait until it is scanned, check the item "Previous Windows Installation"
- Click "OK" → click "Delete File" and it's done
Note: This option does not appear automatically sometimes, and you may need to run the disk cleanup tool as an administrator first.
Manually delete Windows.old (not recommended for beginners)
If you really can't delete it, or if the disk cleaning does not respond, you can try to delete it manually.

But be aware:
- Turn off system protection before deleting (otherwise it will not be deleted cleanly)
- Administrator permissions are required
- When deleting, it may prompt that some files are being used. You can restart and try again.
Operation process:
- Open a command prompt (administrator)
- Enter
rd /s /q C:\Windows.old
and enter - The system will try to delete this folder
If the prompt permission is insufficient, you can right-click the command prompt and select "Run as administrator".
A few points to pay attention to before deleting
- Confirm that there is no need to rollback : after deletion, you can't return to the old system
- Do not delete it immediately after upgrading : It is recommended to deal with it after the upgrade is completed one week.
- Backup important information : Although it does not directly involve personal files, it is recommended to backup in advance for insurance
- The space released after deletion varies : usually around 10~20GB
Basically these are the methods, not complicated but it is easy to ignore details. If you are not sure whether to delete it, you can not process it first and wait for a while before talking about it.
The above is the detailed content of How to remove Windows.old folder?. For more information, please follow other related articles on the PHP Chinese website!

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