I am trying to clear my parent's old Toshiba Satellite pro, but when I try to use the 0 key when restarting it the warning screen doesn't come up and it doesn't make a beeping sound. Instead the Windows Boot Manager screen comes up telling me to chose the Microsoft Windows Vista OS. When I select that, it goes to the Windows error recovery page, and only gives options to restart Windows. Also, if I press the f8 button when in the Windows Boot Manager page, it takes me to the Advanced Boot Options page, however it doesn't give me an option to repair my computer, which is not helpful at all because I want to wipe the computer.