Only the spinning beachball when I try to open anything from spotlight I can't start any programs or open any document from the spotlight since yesterday. 

It finds the right program / document, but when I press enter I only get the spinning beachball for about 40 seconds and then spotlight closes without opening anything.

Any ideas?
For future reference. I had the same problem, but found this solution:


Back up. (You should always have a backup.)
In Finder, select the menu: Go ▹ Go to Folder... and enter:
/var/db/CoreDuet
Delete the files inside that start with coreduetd. In my case it was 3 files.

Enter your Administrator password when prompted.

Reboot your Mac.