Installer Prompt

Every time I start excel, it runs the installer. When I
put the CD in, it doesn't seem to read the DATA1.MSI
file. After I cancel a few times, it eventually starts MS
Excel.

I was wondering what I needed to get rid of this prompt.
I have tried uninstalling, and installing all the
components many times, and have cleaned up the registery.

Some other problems which may have to led to them are:

1. Every time I reinstall, I try changing the registration
information, but it remains the same.
2. In my programs, there is an Office SR-1 Service Pack,
which I can't seem to get rid of.

Thank you for your help in advance.