When you upgrade your Windows installation from Windows 7 or 8.1 you might notice a Windows.old folder in your C:\ drive. Windows keeps an old version of your operating system on your PC in case you are not happy with Windows 10 and want to revert back. Now if you feel you are happy with Windows 10 you are going to want to delete that folder as it takes of several GB’s of space on your system. If you just try and delete the folder Windows won’t let you as it thinks many of the files are system files. No fear though, we are going to show you how to delete the Windows.old folder and free up some space in your system!"
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips