Re-installing is rarely the first (or second or third) option to consider &
often complicates issues. In order to offer any suggestions, though, we'll
need to have more specific info than the scant message you've posted.
First, what version of PowerPoint are you using & what is the exact update
level of the software? Additionally, your exact update level of OS X may be
important as well.
What - exactly - do you mean by "can't find"? Are Dutch terms being marked
incorrectly as misspelled? Are misspelled Dutch words not being marked? It
isn't at all clear what the actual problem is. Describe what you are doing &
what specifically happens, including the wording in any dialogs that appear.
Is this occurring in one specific file? Or does it occur with all files?
Regards |:>)
Bob Jones
[MVP] Office:Mac