As probably stated before you can't delete or uninstall an Operating. The Choices are a refresh a restore or a factory restore. Yes Programs and some Apps may have to be reinstalled but that is the way it is. And you better have your files, pictures, music backup or they may be lost. Sorry, but.... Hope this helps and if you need further assistance post and we will be glad to assist you.
The above opinion is mine and mine alone and doesn't necessarily reflect that of Microsoft, it's employees, or any other member of this forum.
"When we try to pick out anything by itself, we find it hitched to everything else in the Universe." -John Muir