How to replace Microsoft software or hardware, order service packs and
product upgrades, and replace product manuals
http://support.microsoft.com/default.aspx?scid=kb;[ln];326246

stade wrote:

I am running XP and using Office 2003, have been for several years. Now
Excel won't open. I get a message asking for the Microsoft Office Standard
for Students and Teachers disk. Problem is I have lost the disk. I also get
the same window asking for this disk when trying to update to Service Pak 3.
Any ideas?