Installing Windows NT 6.x from USB is almost as easy as installing from a DVD.
- Copy all the files from DVD to USB root
- Open a command prompt windows (Administrator Mode)
- Goto X:\Boot (where x: is your USB drive)
- Run (again where x: is your USB drive)
1bootsect /nt60 x:
When you boot your PC from USB, it will start loading Windows NT 6.x Installation.