Sonar X3 crashing when importing Video

Hello, this is my 1st video in X3 and it didn't go as planned. I used a Cannon DC100 to shoot the video and went to add it into X3 and the system crashed or Sonar said must shut down and multiple times. This was a video that was formerly VOB files that I converted to MPEG and I also tried avi and none of them worked. Anyone have a clue what I'm doing wrong or maybe a computer issue or CPU issue maybe. TIA
 
Bule