Diskpart Clean All Error

gregrocker said:

That Bootmgr missing means it is skipping the flash stick installer and trying to boot the wiped HD so make sure USB stick is set to boot first in BIOS setup before HD, all other HD's and peripherals are unplugged.

I have the USB first in BIOS, it still gives me the error.

gregrocker said:

Next try booting it using one-time BIOS Boot menu key with HD set first to boot.

I'm assuming that's the F12 option. The USB was first there too, I chose it but I still get the BOOTMGR error.

gregrocker said:

Since you have a DVD drive, suggest you burn ISO to DVD using ImgBurn at 4x speed to try that method. Where did you get ISO?

I think I will have to try that, though I will have to go get some DVD's. I got the ISO from my college's software website, from a VPN connection so I wouldn't think the file is corrupt in any way.

gregrocker said:

Did you reset the CMOS? Is your HD registering correctly in BIOS?

According to your past link, I can reset the CMOS by putting back BIOS to its default settings. I tried it, but obviously it resets everyting, including the boot order, back to factory settings, with the HD second after floppy. I've set it back to factory and only changed the boot order so USB was first, but it hasn't worked.
Also, my HD shows up fine in BIOS, along with one other drive, and they both are enabled.

Any other suggestions are greatly welcome. I will try the DVD method and see if it will let me boot.