Applications :: Legit Copy Of Mac Office - CANNOT Uninstall Pirated Version

and yes i know, i shouldn't download illegal versions of software...but i did and now it's going to haunt me forever =( anyways.

1. i downloaded microsoft office for mac 2008. (pirated)
2. i recently purchased a legit copy of microsoft office for mac 2008

when i uninstall the pirated version
- i drag the application from the source to "app zapper"
- i find all the microsoft files and folders and i trash them
- i finally empty trash

When i try to install the LEGIT version, it installs no problem but never asks me to input the serial of the Legit serial key. and when i connect to my network when office is open it say's "blah blah this office is already registered to xxx blah blah" this is because there was myself and this other guy using the same serial from the pirated version and it never lets us use office at the same time. anyways, now that i have a legit (never been used, brand new) serial... i can't even use it...(ie. it doesn't tell me to input the legit serial)