I recently went to a user who had upgraded from office 2007 to office 2010.
He had no issue in open excel files saved in the previous version but word .DOC files would not open.
To fix this problem
Right Click on the Document
Click on Properties.
Opens with info.Capture
Microsoft Office Client Virtualization Handler
Always use the selected program
Click OK, and apply, and now your .doc files should be read by Microsoft Word.
If you cannot find or do not see the “Microsoft Office Virtualization Handler” as a program option.
You can click on the Browse button, and it should be located somewhere near here:
C:\Program Files\Common Files\microsoft shared\virtualization Handler
Your word documnets that had been saved in office 2007 can now be opened in office 2010.