While the tool is designed to bypass activation, it presents significant security risks:

But as he began to explore the new capabilities of his operating system, a creeping sense of unease began to settle in. Something didn't feel right. The loader seemed too good to be true, and he couldn't shake the feeling that he had just made a deal with a digital devil.

While primarily for Windows 7, it also supports legacy systems like Windows Vista and Windows Server 2008/2008 R2.

A: KMS activators emulate a corporate activation server (supported only for Volume License editions). Loaders like Extreme 3.5 emulate OEM BIOS. Both are unauthorized.