all the cracks for x64 out there are just some craps. they 'll only make you think that it actually worked but not really. when the windows reach to its expiration day it 'll just lock up and the worst part is if you did the crack , you won't even be able to activate it any more because when the activation windows pop up it will keep on saying tht you already activated.
this is how those crack works. they just changed the permission of the regstry key called oobetimer in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\WPAEvents. they set all the permission to deny after applying the registry key that is already activated on another computer. so windows can't read the key so it'll think that it is already activated. but the time bomb is still clicking . and the time come it'll lock up and if you don't know how to change it back than you'll be stuck with the windows lock up and won't be able to activate unless you reinstall it. but the good thing about it is if you are not gonna activate it for a while , you can use it to make the activation warning disappear and when you wanna activate you can just reset the permission of the key.