Strategy One : ,
Office 2007 Enterprise Key
 into the method installation CD and operate sfc / scannow command to detect and repair harm and may possibly be topic to alter program files . 
 so that you do not take place again 
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 Strategy Two : 
 run gpedit.msc to open Group Policy ,
Office Standard 2007, 
 and Increase to Laptop or computer Configuration - Administrative Templates - Program - windows file protection 
 get the 
 with SFC command 
 SFC / SCANNOW instantly scans all safeguarded method files. 
 SFC / SCANONCE scans all safeguarded system files as soon as. 
 SFC / SCANBOOT just about every time you start off to scan all safeguarded method files. 
 SFC / CANCEL to cancel all pending scans of secured program files . 
 SFC / Quiet with out prompting the user to switch all incorrect file versions. 
 SFC / Enable to allow the typical operation of Windows File Protection 
 SFC / PURGECACHE distinct the file cache and scans all protected method files. 
 SFC / CACHESIZE = x Set the file cache size