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.

Cannot start Microsoft Office Outlook. Cannot Open the Outlook Window

I encountered this problem when CEO of one of our client companies complained that he cannot work properly because of this. At first, I tried to do with System Restore because I thought that it will solve the issue. After restarting, it's still the same. I thought of reinstalling MS Office applications but I had a doubt that it will fix the problem. I search in Google for the possible solutions but most of them didn't work except for this one:

Steps:

1. Go to Start--Run

2. Type outlook.exe /resetnavpane

Then the Outlook will open just fine. 

This is what this /resetnavpane do: It clears and regenerates the Navigation Pane for the current profile. It's like deleting your profilename.xml in your user directory. This command applies to MS Outlook 2003, 2007 and 2010.