That type of message can occur if part of the install file is no longer on the local machine and/or the application was installed from a remote location.
Some applications look for the msi when adding/making changes/deleting the application.
According to
thisOpenOffice.org installs simply without significant registry changes or placing files outside of its Program Files directory: this makes the OpenOffice.org application easy to relocate to different folders—even on different computers
If that is the case, then you may be able to uninstall by deleting the folder in c/progs.. and then checking theres nothing under the user profile.
Finally then use a registy cleaner or something like CCleaner to make sure theres no orphaned files left hanging around.
it`s not in the start in msconfig
It should be in there somewhere... it may not be under msconfig --> startup tab... but possibly under the services tab?