That was a good article on How To Remove Windows Genuine Advantage How to Remove Windows Genuine Advantage From Your PC Read More .
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.