JMeter stopped on Forever Loop

[Wang, Harry]

for some reason Jmeter (GUI) stopped running after 5 or 6 hours
yesterday.  
 
I have 2 thread groups and they were both HTTP client samplers..  with
100 threads. 
 
Has anybody run into this situation before?   Would a virus scan cause
this type of problem? 
 
Harry C. Wang
Senior Test Engineer
AOL Mobile (Seattle)
Phone # 206 - 268 - 7502Cell # 425 - 260 - 6891
AIM CDID hwang98109