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For an IT professional, having it on your USB key is non-negotiable. It saves you from the "Oh no, I forgot my Windows password" panic. It saves you from data loss. It saves you time.

The short answer is .

Because Windows Setup doesn't fix anything. It only installs or wipes. Hiren’s fixes.

For a home user, it is the difference between paying a shop $150 to "recover files" and doing it yourself in ten minutes.

It booted into a menu that looked like it was designed in 1995 (because it was). You had to navigate using a keyboard, load USB drivers manually, and pray that your SATA controller was compatible.