Can't boot up computer windows 8 installation

I wanted to install Windows 8 with a volume partition and when the Windows 8 was installing it rebooted and it gave me an error:

The digital signature for this file couldn't be verified. File :windows \system 32\winload.exe error code 0xc0000428.

I have tried bootec commands and they didn't seem to fix it.

Also my Windows 7 got deleted and I only have to boot with the Windows 8 error, so I can't do anything not even boot to safe mode. I have tried to install Windows 8 from disk later on and it won't let me because it keeps rebooting and starting the installation again, so I took off the disk before it rebooted and it takes me to that error again.

Remember that's my only boot option so I'm stuck in the installation disk.

Do you have data on the system? If not then there should be an option (from the boot DVD) to install a new copy of Windows 8 (starting again).

Failing that, use a livecd/BootCD (Hirens) to format or remove the partition (using something like GParted) to ease starting the Windows install again.