I keep getting the following message when I try to close a file

"Cannot find 'C:\Program Files\Microsoft
Office\Office11\Library\adaytum.xla'!AdaytumSheetC lose, which has been
assigned to run each time [filename] is closed. Continuing could cause
errors. Cancel closing [filename]?

I never set up any kind of file to run when closing? I did originally
receive this file from someone else. How can I remove this so I don't get
this message everytime I close the file?