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Old windows are files that Windows 10 keeps for a period of time so that you can return to an earlier version of Windows. It is displayed when you click System Files in the Disk Cleanup user interface. If you have upgraded from Windows 8.1, the Windows.old folder is important if you want to return from Windows 10 to Windows 8.1. I recommend you keep it above 8GB, although it occupies a large portion of your C disk, depending on the edition of your previous Windows installation. If you are sure after one month that you will not go back, delete it and you will get more than 8 GB of disk space on the Windows 10 C drive.
The trash is where the deleted files go. When you delete a file, it moves to the Trash folder and always takes up space on your hard disk. Open the trash from your desktop to see what files are available. If you need a file, right-click the file and choose Restore. If you are sure you need these files longer, activate the trash to clean the contents to save disk space.
Windows Temporary files are files left by programs even if you close them. For example, if you open a document in MS Word, you may have seen a linked file with the same extension. For example, if you open document.docx, you can see !~cument.docx as a hidden file. These files are usually deleted by applications when you close them. The rest can be cleaned with Disk Cleaner to save disk space under Windows 10.
Error Reporting Files are essentially logs that contain information about events that lead to inappropriate behavior of Windows or related applications. They are useful for Windows troubleshooting. I recommend to keep them (uncheck the box so that they are not removed).
After clicking System Files, you will see other file categories – including the old Windows installation. They cannot all be safely deleted. As already mentioned, the old Windows installation helps you restore the previous version of Windows. So, if you do not decide to continue with the current operating system, you must keep these files. Other categories include :
Windows Defender files – can be safely deleted
Windows Upgrade Log Files – You need them to troubleshoot if the upgrade did not go as planned. These logs help identify errors that occurred during the upgrade. If you have successfully upgraded, you can delete it.
Device Driver Packages – contains device drivers that you will need to use in the future if a device does not work properly. In most cases, it is only pointers that tell Windows where to look for files. The tip is to keep them
After making your selections in the disk cleaning software, click OK to delete the files. Click Clean System Files to clean more unnecessary files. You will also see an Additional Options tab where you can remove old restore points from the system and uninstall programs.
By default, the disk cleaning software only deletes old temporary files. If you want it to delete the last temporary files, please read Make Disk Cleanup delete ALL temporary files. The disk cleanup command line that allows you to clean even more unnecessary files! If you wish, you can also automate disk cleaning.
Read more : Remove unwanted Windows programs, applications, functions and folders.
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