"The file cannot be opened because there are problems with the contents."

I've been using Word 2007 for months now with no problem, and suddenly when I try to open a .docx file, it says "The file cannot be opened because there are problems with the contents."

I searched for the same error and tried whatever I found. I downloaded the service packs to see if that would work and it didn't. I tried opening the files in "open and repair," but it won't select "open and repair." When I select it, it gives me the blue loading circle in place of the usual mouse arrow, but then Office Word 2007 becomes non responsive.

I'm using Vista with the original install of Microsoft Office Word 2007, if that's relevant.

I'd be willing to try just about anything. These files include my college application essays and scholarship applications that are due this week. If anyone would like to help me overcome Murphy's Law, I'd sincerely appreciate it.