Office 2007 Open Word Document Window

I have found that when I run word 2007 or any other office 2007 program and go to the open a file icon, you then get the open file window that has all of my word documents. Since I saved them with thumbnails, there is a thumbnail of each document saved. Now here comes the problem; over on the right there is the preview pane and when you click on a file for preview, I get the error message: "This file can't be previewed because of an error in the Microsoft Office Word previewer". Of course I have googled this problem, but I haven't found much info other that to run the program with the /a on the end of the desktop short cut which turns off many of Words add-ins and other things that I really don't know about. Yes when you run it in this mode, the preview handler does work as it should. Does know the cause of this behavior and have a solution?

Since running the program with the /a locks out plug-ins and such, I should of known that a plug-in was causing the problem. I disabled Adobe plug-in and it now works. How about that.