That was a good article on How To Remove Windows Genuine Advantage
How to Remove Windows Genuine Advantage From Your PC
Now what about Microsoft Office Genuine Advantage? I’ve seen how to remove it for Windows XP, but Windows Vista and Windows 7 are different.
It would be good to know which version of Windows and Office you are talking about.
I second Mike, please provide your Windows version as well as the version of the Microsoft Office.
I've found a guide here which might help you out. There are 3 solutions, one of which involves messing around with the registry so do be careful if you're going to try it.
I'd also not recommend using a crack or other executable, as you never quite know what's inside. If you do decide to go this route then use a service like VirusTotal to scan the file or archive first.
I will probably do an article outlining the basics on how to do this at some point.