Windows 10 clears the Delivery Optimization cache automatically but may leave residual files. Delivery Optimization Files: Delivery Optimization files are updates your computer gets from other computers on your network.Create additional disk storage space by deleting the files on your computer and keeping those files online only. OneDrive files: If you sync your OneDrive files to your PC, your files are stored in two places.Recycle Bin: Before you delete the contents of the Recycle Bin, recover any needed files first.These temporary files go away when the app is closed. Apps create temporary files to process data while the app is open. Before you delete these files, close all apps. Temporary files: Temporary files slow down the computer.If you don’t need to roll Windows back to a previous version, it’s safe to delete these files. Temporary Windows installation files: These files contain older Windows installations.Deleting thumbnails frees up disk space, but they'll take time to download the next time you browse your files. These thumbnails are stored in a cache database so you can quickly preview a file. Thumbnails: Thumbnails are the small preview images for files and folders that appear in Windows File Explorer.If the computer has problems, you’ll need these to reverse any Windows updates. If the computer operates fine, delete these files. Windows Update Cleanup files: These files are left over after a Windows update.Windows Defender Antivirus files: These are temporary files and deleting them doesn't affect the applications installed on the computer.

However, if the computer is having problems, you’ll need these files to uninstall updates and troubleshoot Windows problems.

System created Windows error reporting files: In most cases, it’s safe to delete these files.

These files may contain important troubleshooting information.

Windows upgrade log files: If the PC is having problems after an upgrade, don't delete the Windows upgrade log files.

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