Usually there is a recovery partition, and Windows 10 has a built-in function for a refresh/reinstall from the recovery partition. No USB drive needed. I did th

Usually there is a recovery partition, and Windows 10 has a built-in function for a refresh/reinstall from the recovery partition. No USB drive needed. I did this recently over the phone for a relative's computer, but I forgot the exact name of this feature in the settings/control panel. In my case, it was necessary because the computer had not been used for months and was unable to connect to various websites, perhaps due to an out-of-date certificate. Rather than troubleshoot the issue, it was easier to just do the refresh.