Quick Fix: How to Free Up Space on PC With Windows Disk Cleanup Get rid of duplicate files as well as space-hungry apps.Delete the files you do not need anymore.20 GB of free space to upgrade a 64-bit OS.16 GB of free space to upgrade a 32-bit OS.To install Windows 10, you need at least: Before we get into more complex solutions, let’s get some basics out of the way.įirst, make sure you have enough space on your PC o therwise, the installation is likely to fail.