Re-installing Microsoft Office 2003 Basic Edition

I had Microst Office 2003 basic installed on my computer for along time,I used it one day then the next day I went to use it said it was not installed, I went re install from their disk and it said missing YS561405.Cab, can anyone tell me how to and where to find it so I can reinstall? I went to Microsoft site and could not find it and could not get any answer from them

Thank You