remove write protection from disk

You can't format optical media with the same Windows formatting tool that's used to format floppies, pen drives and hard drives.

You have to use a different method, also DVD-R media can only be formatted once.

See this for how to format optical media: http://windows.microsoft.com/en-gb/windows-vista/format-a-cd-or-dvd#

You only need to format optical media if you want to write files directly to it (not recommended). Formatting not necessary if you use mastering software like Nero Burning ROM or Roxio Media Creator.