The primary appeal of a pre-activated ISO is convenience. In a standard installation, you are required to enter a 25-character product key and go through the Windows Activation online or via phone. A pre-activated version bypasses this step by embedding a "loader" or a volume license key directly into the installation media.
Here is where the warning signs flash red. Downloading a pre-activated Windows 7 ISO from a torrent site, file-sharing forum, or random blog is one of the most dangerous computing habits you can adopt. Below are the tangible risks. Pre Activated Windows 7 Iso File Download