Windows installer appears everytime when Office is opened

Problem: After Office 2007 was removed and Office 2003 reinstalled, installer pops up

This didn't help: Group policy, msiexec command, reinstalling office.

This helped:

Windows installer cleaner

http://support.microsoft.com/kb/290301

There were Office 2007 references,

when Office Plus 2007 was removed, installer message didn't appear again.