Hello, homeslice.
You can do either of the below.
[1] Click out Start | Programs | Startup, then rightclick on the Office OSA and choose delete or disable it.
Or
[2] Go to the Startup directory, maybe not the one under windows\Start Menu, but under windows\Profile\<username>\Start Menu\Programs. Then, do the same as [1]. I guess you didn't find it because you were looking for the wrong Startup directory.
regards - tsuji