Recently I found out on my C:\ there is a folder `windows.old` probably this is due to the fact that I refreshed my Windows 10 using a Recovery software from Microsoft.

Can I safely delete Windows.old Folder?

Yes, The `windows.old` contains the previous Windows installation files, and is scheduled to be deleted after 30 days by OS. Prior to then, those files are protected and can’t be deleted unless you use the Storage sense.

Go to Settings and Navigate to Storage

Select the Temporary Files, you will see Previous Windows Installation, Tick it and Click Remove.

By default, the Temporary Files will be kept 30 days before they are automatically removed. You can configure the Storage sense to remove them immediately or set a shorter expiration.

You can also configure to let it clean the files every day, week or month. This should free up your harddisk space.

–EOF (The Ultimate Computing & Technology Blog) —

推荐阅读：
数学题:3条小狗、5条小狗和树间小路　 数学题：小雨家有6个从里面量得底面积是30²　 数学题：截至2011年年末　 被油漆过的小正方体有多少个？（六上）　 戴口罩出门买口罩数学题　 加一笔，让等式成立　 找规律8+11=？　 三个全程的问题解析　 两个质数的和差积商一定都还是质数吗？　 谁是单位“1”?(六上数学题)