No big deal, you're welcome
did you install a arduino library before?
You should have (or create) a "libraries" folder in your arduino sketchbook folder and extract it there. To find the sketchbook folder first, go to "File" => "Preferences" in the arduino IDE, it should say something like this (depends on your operating system and language):
C:\Dokumente und Einstellungen\sui\Eigene Dateien\Arduino
This is how it should look like extracted:
After that close and re-open the arduino IDE, because it only scans the libraries folder on startup. The example sketch should work then as it is.