Grey column hiding view of workbook

Couple of things you can try, look to see if Split Panes is being used found under WINDOW on the toolbar or Freeze panes, you can also look under the DATA heading and check that Group and Outline is turned off, or VIEW Custom Views and make sure a custom view isn't selected, failing that if you are running Excel xp or 2003 then you can save the attached file as it is (don't change the name) on your desktop then open it and close it then see if yours is any better, the file below is Excels base file.