Do you receive a BSD? Or does your comp just restart. Generally these issues are hardware related, but can be set off by various programs. Which graphic card do you have & which version driver? See
What type of computer do you have? Is it a desktop or Laptop?
Look thru these to see if there's anything similar:
1.
http://www.gnutellaforums.com/showth...&highlight=bsd
2.
http://www.gnutellaforums.com/showth...&highlight=bsd
3.
http://www.gnutellaforums.com/showth...&highlight=bsd
4.
http://www.gnutellaforums.com/showth...&highlight=bsd