Help I can't install windows 7 or format it

So I'v been working on with windows 7 proffesional and I'v desided to go for windows 7 ultimate,so I will be able to use updates and could able to change language.
What happend after that is history,after I'v done installing windows 7 ultimate I'v started to download the motherboards Program and the activation of the windows itself,but someone putted trojan horse in the file.
the moment after I realised it happend I did fast as I could to bring eset nod 32 antivirus to computer to block it, the trojan horse blocked the installation of the anti virus so I turned off computer.
I was thinking what to do? I decided to format it again so the virus will gone.
From that moment I couldn't enter any disks or use formatting through usb,I could only use the same iso disc of the windows 7 ultimate,I also thought it recognise it cause it has to be infected,I'v tried reboot all system.
Restart the motherboards and the bios but nothing changed,I used all windows installation tools to repair the damage have done but nothing changed. my computer is new (intel I7 4cores,nvidia gtx 1060,8g ram,2tb)
please I'm affraid if I will go to the store I bought it,if they will realise it was trojan hack they won't fix it.
Any suggetion what to do??

Hi, I would like to help you, but there's one quick question I have.
Was the trojan horse in the Windows 7 installation before you downloaded the motherboard program, or did it appear after downloading it?

no,It didn't went this way after the windows start up everything was clear,I installed the motherboard

after that I'v searched for serial for windows ultimate so it will be able to remain like original,

I'v searched download and I found trojan hack,before I turned off my pc after I realised it got my whole computer, the nod32 antivirus said "trojan hack detected on memory system"

thats what cause I think failure of formatting,the computer can't find driver c/d or any .

same with other cd/dvds, the weird thing is the computer is recognize the same dvd with the windows 7 ultimate installation but other installations it can't activate

I'c just searched on google for windows loader by daz,it was a big mistake to download from unknown user,the trojan hack just caught me not ready /:

yes,do I have other choices? to pay 100$ for official windows or get it free :/
but I understood other problesm that windows 7 is not supported cpu-Intel I7core 6700
and also I should have install windows on ssd.
I think all those made the bios warnings and errors.

I understand man,thanks for honesty.
here in Israel any purchase os takes a lot of money from our hands.
I still don't understand why it's cost 100$ dollars?? it doesn't give me too much choices :/