Ive been messing with this all day now and all the "tutorials" I have read work great up until the part where I have to type "BOOTSECT.EXE/NT60 I:" and it says its not recognized?

My question is how do I install iDeneb v1.4 via external hdd?
I have the image, everything partitioned I just need to find out how to get my computer to recognize the ideneb.iso, when i try and load from USB Device it just shows a black screen with a single blinking dish (command prompt-ish lol) and i cannot type or anything only crtl+alt+delete works for restarting the computer

Thanks in advance, hopefully this is informative enough to get some help