I can understand what you mean when you say you have never seen this before
Since you are confidant your bootable Win7 USB works just fine, we’ll accept that
On the new hard drive, are you sure it’s properly installed and ready to use?
On trying to install Windows 7, are you trying to do an upgrade to Windows 7 from a prior OS?
--- If so did you run the Windows 7 Upgrade Advisor to see if there are any issues – including drivers?
--- There might even be a BIOS issue
The USB is seen in the BIOS but even though you try to set it up to boot from it doesn’t
--- Those driver packages you are trying don’t help
--- Go to the manufacturers website and attain the drivers for your make/model and burn them to CD so you can apply which ones you need to your computer
--- Since the computer doesn’t boot up how are you installing driver packages?
Do you still have the old hard dive and are you able to reinstall it?
--- In fact s it possible to test your Win7 boot USB in that case?
--- If so and it the Win7 boot USB wants to work, then it probably means the new hard drive still needs some finishing setup