How to restore from an ex. HardDrive system image w/o Legacy USB?

[TF2User]

As the title states, I have an external hard drive on which I will back up my system image, but don't you need Legacy USB turned on to boot the new system image from the BIOS? I have no CD drive on my netbook and the down arrow key is missing, so I can't select anything in the BIOS. Boot options (pressing f8 repeatedly while booting) works, but it doesn't give me a method to boot into a system image. I've been fiddling around with the imageres files and so far nothing terrible has happened, but I want to be able to save my computer if something were to happen. Any ideas as to what to do would be greatly appreciated.

Edit: It also has no PS/2 port, which the BIOS only seems to allow for an external keyboard's use.

 

[andrew129260]

Was this system image created with windows backup utility?

Or another program?

If windows backup and restore was used:

You can always reinstall windows and go into the backup and recovery in control panel and do advanced recovery methods-restore from a system image you created previously.