Crash when attach PDF to a reference in X6.0.1

My endnote X6.0.1 crashed when I attached a PDF file to a reference. It happens all the time and bother me a lot.

please help me

Below is the crash information:

Problem event name: APPCRASH
Application name: EndNote.EXE
Application version:
Application time stamp: 508991a8
Failure module name: ntdll.dll
Failure module version: 6.1.7600.16915
Failure module timestamp: 4ec49d10

exception code: c015000f

Abnormal offset: 000843f9
OS  version: 6.1.7600.
Regional Settings ID: 2052
Other info 1: 0a9e
Other info 2: 0a9e372d3b4ad19135b953a78882e789
Other info 3: 0a9e
Other info 4: 0a9e372d3b4ad19135b953a78882e789