Using Windows 2000 Pro and Office XP. All service packs have been applied. When you open excel it opens and you see the outter area of the excel program but where you should be seeing cells you can see whatever is behind it. In Task Manager when this happens it shows 2 instances of excel.exe running. When you close down all open excel document there is still one instance in the task manager. When you end process on it you can then open excel without issue. Any help with this would be appreciated as it has been an issue now with about a dozen systems here at work and so far for a final fix you must rebuild the pc but for now we are just using the end task as work around.