There are two ways to help with this: One way is to add additional storage memory. This can either be in the form of a microSD card installed into the WinBook Tablet’s memory card slot, or, it can be in the form of an external USB flash drive. Files such as documents, pictures, videos etc. (NOT program files) can be moved to the new storage to free up space on the main unit. Another way would be to just free up additional space on the internal storage memoryby uninstalling unused programs, deleting unwanted data files such as documents, pictures, music, or videos, and by running the Windows Disk Cleanup Utility to free up available space. The free space needed to reset Windows needs to be free on the main (C:) drive.