Check out this site. It contains links to free software for CPU, Memory, Video, and other tools for stressing your system to find the weak link (if you have any).
 
 
http://www.zdnet.com/blog/hardware/how-to-stress-test-your-new-pc-to-shake-out-any-faults/16438 (http://www.zdnet.com/blog/hardware/how-to-stress-test-your-new-pc-to-shake-out-any-faults/16438)
 
 

Thank you, Jim. 

My wife has a new PC, less than two weeks old.  It seems very powerful compared to the old one which was slowly dying.  This test site will make sure the new one will last.