>I can install it on one PC, meaning since the old one is nonexistant, I can install it on another PC? I see some vendors selling just OEM versions of Windows by itself. Is that legal?
An older version of the OS can NOT legally be installed on a new machine, if the new version, which replaces it, is an upgrade.
Methinks that selling just the OEM is illegal. It is supposed to be sold with a new machine, or with a hardware upgrade of US$ 200 or more, IIRC.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)
