Click on the Windows start button and then on Control Panel and then on the Programs item and then on Uninstall a Program and then select Microsoft Office 2010 and then click on Change and when the installer starts, click on Repair.
However, first you may want to look at the Knowledge Base article "How to troubleshoot problems that occur when you start or use Word 2010, Word 2007, Word 2003, or Word 2002" at:
http://support.microsoft.com/default.aspx/kb/921541?p=1
Use in-build "open and repair"utility of MS excel to repair damaged .xlsx files. Follow thesesteps to it
On the File menu, click Open.
In the Open dialog box, select the file you want to open, and click the arrow next to the Open button.
Click Open and Repair, and then choose which method you want to use to recover your workbook.
Most probably your problem may get fixsuppose due to any reason it can't fix your problem then use thirdparty excel repair softwarehttp://www.stellarinfo.com/excel-recovery.htm
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