I have a theory due to which i recommend NOT using the hactivator variants. Instead choose a KMS Activated copy.
I won't go into boring details but short version is ... Microsoft is now trying to connect your Microsoft/Hotmail/Live account with Windows and they might be keeping track of pirated copy users, and they might do something harsh somewhere in time. I am not saying there is a certainty but there is a possibility. (Heck they may already know of such users but might not do anything just for the sake of "market share").
Think about it. People who are activating Windows 8 or 8.1 via Hactivators, may also feel this extremely annoying where Windows will start asking them to use a "Microsoft Account" whenever they open up Store or any other Metro Application ... and they might end up using an Online (Microsoft) Account unknowingly (which will shift your "Local" profile to an "Online" profile -- attached to your Microsoft Account ... just like Google Account for Android).
Anyway, this is just a theory so ....
For KMS Activation, head over to MyDigitalLife forums & look for "KMS Pico". Your OS will be activated for 180 days but it'll be re-activated for another 180 days whenever windows will initiate an activation check. The benefit is that it doesn't modify any system files whatsoever and acts like a "Trial Extender".