|Very long shot... but sometimes they work...|
Download/run the free utility at tweaking.com.
Perfectly safe to run, I have tested/run a couple of times to great effect. Ideally run in safe mode, but will run in normal mode too. Follow all the steps. It will find and fix any errors it detects witthin the windows system as is; including many of those issues which affect some of the major MS office apps. (which is how I came to discover it via another forum discussion).