Ok to start;
My game does start , but it won't run what i mean by this :
I can click my shortcut and it will load up validate when necessary then after the whole process it will come to my start up screen; where you choose which character your gonna play; and when i choose my character it shuts down, once once long ago it started up but i decided to see if i could finally play and restarted it,obviously it didn't work. When i initially got the game it worked perfectly i played a couple times with friends but now i can't even play,Help.

I'm using a sony viaos older version (2007-2010) laptop windows 8 steam
Thanks in advance