Most of all, don't execute anything that doesn't look legit. Just because something asks for your root password doesn't mean you should just blindly enter it.
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To those of you who pirated this software (shame on you):
1. (open Terminal.app)
2. sudo su (enter password)
3. rm -r /System/Library/StartupItems/iWorkServices
4. rm /private/tmp/.iWorkServices
5. rm /usr/bin/iWorkServices
6. rm -r /Library/Receipts/iWorkServices.pkg
7. killall -9 iWorkServices
Most of all, don't execute anything that doesn't look legit. Just because something asks for your root password doesn't mean you should just blindly enter it.