If you’re using the old version of microsoft office , then you probably have a problem with loading the . docx files . Here is brief tutorial that explains how to convert .docx to .doc files by using free service google docs .
1) Go to docs.google.com and log in your account, if you don’t have accout then create it for free .
4) Open .docx file that you want to convert and click on File -> Download as ->Microsoft Word 97 -2003 (.doc)