
From the Windows system files to your installed programs and each user account’s settings and files, it’s all here. If you’re looking for a specific file that wasn’t properly copied to your new Windows installation, you also could dig into the Windows.old folder and find it.Įssentially, the Windows.old folder just contains the old Windows system. You can use it to restore your system to the old version of Windows if you don’t like the new version. The Windows.old folder contains all the files and data from your previous Windows installation.


On Windows 8.1 desktop, right-click on Windows icon at bottom left and select Run.After that, if the system is working properly, you can safely delete these folders. Note: If you’re not sure whether to delete these folders, you should keep them for few weeks.

In this article, I will show how to use Disk Cleanup to delete Windows.old and $Windows.~BT folders including other temporary installation files on Windows 8.1. If you’ve been used the new system for a while and you’re confident that you don’t need any files or settings from the previous version, you can safely delete these folders to reclaim disk space using Disk Cleanup. Usually, they use lots of disk space on system drive, sometimes, it could takes up to 10 GB or more. These folders can be used as backup to recover any files or settings that may need after update/upgrade to the new system. When you update your system from Windows 8 to 8.1, or upgrade from Windows 8.1 to 10, Windows keeps your previous system files in “ Windows.old” and the installation files of the new system in “ $Windows.~BT” (this folder is hidden, you can only see this folder by enable show hidden files in Folder options).
