I have installed the windows vista on mine system and I have also using the Microsoft office 2007. Mine system works fine without any issue but I have small issue on mine excel. I have upgraded mine Microsoft office 2007 to Microsoft office 2010 and upgrade was complete without any issue. 2 days before when I open the .xls files which was created in earlier version it gives error message saying that, ď"The file is corrupt and cannot be opened". Now I am not able to open the any .xls files on mine newer office. I donít know how to solve this issue. Can anyone suggest on this issue.