Cannot Open MS Excel file by double-clicking on it (MS Excel 2007)

One of our managers is always getting this error when double-clicking an Excel file or opening it in the Recent Documents:

"Cannot find the file C:\ My Documents\file.xlsx (or one of this components). Make sure the path and filename are correct and that all required libraries are available."

I tried to re-install MS Office but it didn't work. I searched in Google and found this solution:

Steps:
1. Open MS Excel 2007.
2. Click on the Office Button in the upper left part of the Excel window.It looks like this:

3. Click on Excel Options then Advanced.
4. Look for General category.
5. Remove the check mark on "Ignore other applications that use Dynamic Data Exchange (DDE)".

6. Close MS Excel application and now you can open any Excel file by double-clicking on it.