New
#11
You can use the disk as either an upgrade, an installation or a recovery disk.
Alternatively, you could try the Toshiba info linked and quoted by @caperjack to access the Toshiba recovery partition (if it is still functioning correctly). It may be able to rebuild your original Windows installation. You could then use your new USB Win10 disk to do the upgrade if you wish. Lots and lots of ways to skin a cat.