Keeps reverting to Boot Manager on startup

Sorry if this has been asked before, but I couldn’t search ALL pages of this section (although I searched a lot using keywords BIOS and Windows boot manager).

Anyway, I just did a new build and installed Win7 Pro 64 bit on a Kingston HyperX Predator M.2 SSD. However, I forgot to enter audit mode to install user files and program data to another drive – something I ALWAYS have done in the past.

So I decided to do a clean install on a clean drive – which I have successfully done many times in the past.

My problem is something that has NEVER happened before. No matter how many times I set the bios to boot from the Win installation DVD (so that I can abort the process and access diskpart) it always reverts to the Windows Boot Manager and brings up the installed operating system.

So I tried setting the BIOS to boot from the DVD with a bootable Killdisk DVD in place. Same thing – reverted to Windows Boot Manager and booted into Windows. Same thing with my bootable WipeDrive DVD. So tried to set the BIOS to boot from a 3.0 USB (which contains a bootable Killdisk). No luck. Same result.

Apparently there’s NO WAY to get the darn operating system off the SSD so that it can be reinstalled in audit mode. And this will also cause me troubles in the future, as I do clean installs of the OS about twice a year.

And the attached image is something weird that I’ve never seen. What’s an EFI system partition? Never seen that before. Is that why I can’t manually set my boot order in BIOS? Note that the system drive is formatted NTSF, as I have no need for GPT.

Thanks in advance for any substantive help that may be offered.

So sorry. Please disregard. Saw this on the Hexus site:

"This is the expected behaviour for a UEFI install of Windows Vista, 7, or 8.

You cannot boot a "drive" with UEFI. This is an artefact of BIOS booting, where the start of a drive contains a chunk of 16-bit 8086 machine code to handle first stage booting.

With UEFI, an EFI application (BOOTX64.EFI) can register itself with the firmware, along with a friendly name ("Windows Boot Manager"), and you boot one of your registered applications, not a drive."

So I got into BIOS, set everything to legacy, and was able to boot to the Win7 installer DVD, go into diskpart and clean the drives.

Again, sorry.

Susan