After booting Windows 7 Ultimate - the whole screen turns into red

Lets use Mini Tool partition
Download and install.
Open Mini Tool partition
Right click on the USB drive. On the menu options that opens, select Active.
On the top left hit apply.
Confirm that the USB drive is now set as active.

Apparently, this USB is active already! and if I try to boot it, still the same black image appears like before.

It doesn't make sense.
Let's try to start from scratch.
- With the Mini toll partition wizard, right click on the USB drive, and select Delete.
- Right click and select Create. On the window that opens, select:
- Create as: Primary
- File system: Fat32
- Apply
Close Mini toll

- With 7 zip open the Win7_HomePrem_SP1_English_x64.iso file you downloaded and extract all files and folders to the USB drive.
- Extract the boot.zip to efi folder.
- rename \sources\ei.cfg to ei.cfg.org

Open Mini Tool partition
Right click on the USB drive. On the menu options that opens, select Active.
On the top left hit apply.
Confirm that the USB drive is now set as active.

Try to boot from the USB drive

harant said:

and if I try to boot it, still the same black image appears like before.

I'm now under the impression that stick is lacking a boot sector.

Making a Bootable USB with Windows 7

Active makes the boot sector.
Did you do the previous instructions I gave you (start from scratch)?

Bootsect.exe makes the boot sector.

@harant I'm beginning to suspect your USB drive has a problem:
- It failed when you used MS USB toll (Post 18)
- All the attempts to make it active using diskpart gave some kind of error.

Where did you bought the USB drive?
Did you run a drive test on it? Have seen many fake or defective drives. I myself bought a Kingston 16G DataTraveler SE9 that wasn't working. Had to replace it under warranty.

After trying two different USB and two different ISO files, I have decided to give it a shot with the 32-bit version and it worked!

I want to thank you all for helping me out! Specially big thanks for @Megahertz07.

I'm running a Driver Booster and it helps me with the installation :)

Can anyone recommend a good antivirus and firewall?

@harant, I've sent you a private maessage that you didn't answer.
I'm frustrated. I still don't know why all the attempts failed. I'm only satisfied with a game over.

For the antivirus I use Avira free and Superantispyware free
For the firewall I use an old version (9.2.106) of ZoneAlarm 9.2.106 free (the best software is the one you know how to use it)

Best Free Firewalls for 2020 (9 for Windows and 1 for Mac)