File does not open

P

PE

Excel 2007: when I click on a spreadsheet to open it, Excel loads but the
file does not show up. However, as soon as I hit the Alt key the file shows
up. Once a file is open in Excel there is no problem opening other
spreadsheets by clicking them.

Seems to be a common problem - same happens on a friend's computer.

Any idea how to correct this?
 
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