Why is my computer still crashing?

How Can I Stop This Blue Screen?
I just got a new computer 2 days ago through replacement of my old one in warranty. I didnt download any software on it and I get these? Maybe its a site ive been on or what. Idk? I have antivirus. I had the same problem with my last computer.

I didnt even put my old files on the new computer.

Dell Inspiron 620

http://tinypic.com/r/30wb709/6

http://tinypic.com/r/macu9z/6
why am I getting this messages?
 
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