Doing a little research reveals that MS09.dll is a file included with Office 2000.
Did this machine have any Office 2000 components installed at one time?
Here are a few KB articles. Everything seems to point to installing the latest service packs.
Excel 2000 may cause an invalid page fault in MSO9.DLL when you save a file
http://support.microsoft.com/kb/248167
"OUTLOOK caused an invalid page fault in module MS09.DLL" error message when you open a shortcut
from the hard disk with Outlook 2000 running
http://support.microsoft.com/default.aspx?scid=kb;EN-US;303179
How to obtain and install the Office 2000 SR-1/SR-1a Update:
http://support.microsoft.com/default.aspx?scid=kb;EN-US;245025
And this a quote from someone else on this subject:
"This is a problem with Microsoft Office's installation. Make sure that your computer has the most
recent service packs for your version of Office."
Hope that solves the problem for you.