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Estorehf's avatar
Estorehf
Brass Contributor
Jun 24, 2026

To completely reinstall Windows 7 from USB drive, I need help!

Hi, guys. I have a USB drive with Windows 7 installation files, but I cannot figure out how to boot from it and I am worried I might delete everything on my hard drive by mistake. I have already tri...
Poapba's avatar
Poapba
Copper Contributor
Jun 24, 2026

So you pressed F12 and got a black screen? That's super common, and it usually means one of two things: either the USB isn't bootable properly, or your computer's BIOS settings aren't cooperating.

Here's what to do before learning how to reinstall Windows 7:

1. Check your BIOS settings: Restart your computer and tap the BIOS key repeatedly as it boots up—it's usually Del, F2, F10, or Esc depending on your motherboard. Once you're in, look for a setting called "Boot Mode" or "UEFI/Legacy". Windows 7 was designed for older BIOS/Legacy mode, so if your PC is from the last 8-10 years, you might need to enable "CSM" (Compatibility Support Module) or switch from UEFI to Legacy. This is often why the USB just doesn't show up.

2. Set USB as first boot device: In the BIOS, find the Boot Order menu and move your USB drive to the top of the list. Save and exit.

3. Still stuck? If your USB isn't appearing at all in the boot menu, it might not have been created correctly. So, you must know how to reinstall Windows 7. Try using tool instead of the old Microsoft tool—it's free, portable (no installation needed), and way more reliable for modern PCs. Pick the right partition scheme: MBR for older BIOS computers, GPT if you're using UEFI.