Alienware 17 memory issues

Good day,

I have bought a new Alienware 17, I'm having some problems that points to memory issues:

-Lasting to much starting up, sometimes I have to restart the computer to get it right because it gets stuck

-The first time I did a system autopsy several parts of the test failed and the system crashed  (blue screen)

-I refresh the system and try againg with the autopsy, the normal test went fine but the stress test failed big time.

-Some blue screens that I investigate later and shows there is a memory problem

Your good comments will be greatly appreciated.

Currently I have a Windows 8