Right. "...it is not possible to low level the drive outside the factory." Low level format lays out the sectors so they're ready to contain the bits.
Sooo... to clean your Windows registry, you're going to turn your disk into a blank piece of metal, then have Western Digital low level format it into a magnetic hard disk again, huh? IDIOT!
Hey! Just to be *sure* AdAware is gone, maybe you should turn the disk to rust, extract the iron and smelt it and reforge it into a new disk again!