I just ran across this problem today and I have been looking on this site for a fix and found that none worked. But this is what I ended up doing to fix the problem that I had.

Excel closes and restarts. I found that if you go to the “More Command” on the top toolbar and click on the Add-Ins then go to the bottom drop down menu to the “Disabled Items” and click on the items that are disabled to enable, then close Excel and re-open Excel it should work.
This fix will probably work for Word, PowerPoint, Outlook .
Also if the Add-Ins can be unchecked then uncheck them, if you have to go to Regedit then change the numbers to 0

Tresan, you are a Genius. I struggled for 3 weeks before I found this forum. You ROCK! Thank you.

Originally Posted by Tresan

I just figured out a fix.

Start, Accessories, Run

Enter "regedit" and hit enter

Now look into:

HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Word
Find the "Data" folder and rename it to "Old-Data"
Start Word again and the problem is fixed.
It seems its due to a change in the standard settings in the last office update - and hence has nothing to do with drivers og vista sp1 etc.

You are absolutely brilliant! This problem didn't start affecting me until this past week, but the fix worked! Thanks so much, it was driving me crazy!

Originally Posted by Tresan

I just figured out a fix.

Start, Accessories, Run

Enter "regedit" and hit enter

Now look into:

HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Word
Find the "Data" folder and rename it to "Old-Data"
Start Word again and the problem is fixed.
It seems its due to a change in the standard settings in the last office update - and hence has nothing to do with drivers og vista sp1 etc.

### Tresan you rock. This resolved the problem that started happening two days ago on my Vista PC. Thanks.

i found this:
Word 2007 won't shut down - Microsoft Answers
basically there seems to be no renaming of the "Data" folder - just a deletion

Thanks a lot for your help. I am new to this side but got very essential info, even i was facing this MS-office problem.

Many thanks, i had the same problem and here it is solved!! voila
Thanks again