Cant open excel
 

Every time I try to open Excel it won't allow me to do so. An error msg comes
up saying "The feature you are trying to use is on a CD Rom or other
removeable disk that is not available. Insert the Microsoft Office XP
Professional with Front Page disk and click ok.
Only thing is we don't have the disk.
Any ideas would be mostly appreciated. It has just started this problem
since yesterday.