It supports nearly all versions of Windows 7 (Ultimate, Professional, Home, etc.) in both 32-bit and 64-bit. Safety Profile:

Among piracy tools, Daz's version is often cited as being free of the malware typically found in other "activators," provided it is downloaded from a reputable source. Important Considerations 7 loader by daz 2.2.2

It fools Windows into believing the computer is a pre-activated machine from a major manufacturer like Dell or HP.