odi u folder u kojemu je instaliran OCCT i pronađi datoteku "Thread 0" ili "Thread 1" i očitaj što ti piše. Pa usporedi:
Code 1 : The thread stopped because another thread has stopped
Code 2 : User interruption (Off button clicked)
Code 3 : Not enough memory to run the test
Code 4 : Calculation error detected
btw. pogledaj i što ti kaže pod System event viewer(RMB na my computer-manage-system tools-event viewer-system) i gdje imaš crveni znak pogledaj što piše, možda te jednostavno neki driver muči