How do I use the deltree command to clear my hard drive?

***WARNING – RUNNING THIS SCRIPT WILL DELETE EVERYTHING ON THAT IS NOT IN MY DOCUMENTS, THAT MEANS EVERYTHING. PROGRAMS, DOCUMENTS, PICTURES, LETTERS, EMAIL, EVERYTHING. Make sure you have backup media before you continue like a Windows cd, driver cd, programs, and backup your data first***

     Boot to a Windows boot disk and use the following script.

When you boot to the Windows boot disk you will be at a “a” prompt.
Type “c:” and hit enter
Type “cd windows” and hit enter
Type “smartdrv” and hit enter
Type “cd\” and hit enter
Type “copy c:\windows\command\deltree.exe” and hit enter
You will see “1 file(s) copied”
Type “deltree /y c:\windows” and hit enter
Type “deltree /y c:\progra~1” and hit enter
Now you can install Windows