Upgrading Software Factories from 2005 to 2008 (Problems uninstalling)

So you want to update your software factories to 2008 and cannot uninstall / install.
1st Install the windows installer clean up.
2nd Remove with the windows installer clean up the factories and guidance packages.
3rd Install your guidance package in 2005 version.
4rd Uninstall it again.
5th Using the guidance troubleshoot get all the registry keys
6th Delete registry keys.
7th Install.