bios doesnt let me move boot order ,or use command prompt or any of the other normally usable things as it says something missing each time it tries to work so how do i wipe the hard drive then re install win 7 starter with usb .i have a tool to make iso bootable and i have iso ,to use once i can clear the drive ,the iso runs for so long but always stops and says it cant finish so nothing will be changed so back to square one,pleas help