Do as the following says: Step 1: Type disk cleanup in the search box of Windows 10 and launch it.Step 2: When the application is launched, it goes to the drive by default in which your Windows installation is located. When reading here, you may think it is useful to remove Windows 7 after installing Windows 10 in order to release some disk space which can make your system partition spare to some degrees.So, how can you get your precious drive space back? All three are pretty straightforward, so pick the method that works best for you. So, make absolutely sure that you’re happy with Windows 10 before you remove this folder.This is actually the reason Microsoft prevents you from simply deleting the folder, even with admin rights.
However, it is useful to get a few gigabytes of space from system partition on small hard drives. When upgrading your Windows 7/8.1 to Windows 10, the previous Windows operating system files are stored to a folder which is called .
And now, we will show you how to resize the system partition step by step.