assasins creed 2 help !

i got a question i have the game, non-legit and i installed skidrows crack, so i go into abstergos animus the first one, and it works i can see how i am born.
then when i escape and into the 2nd animus when i sit in it it just crashes back to desktop is it the crack or my pc specs:
processor Amd athlon 64 x2 dual core processor 5000+
2.60 Ghz
Ram 4,00 GB
Windows 7 Ultimate 64 bits.
Directx11
512 mb video card
i dont know if this is graphics card :
NVIDIA Geforce 8400 GS
( by the way i already completed the 1st one, and i am not getting the white screen bug, if you dont know what that is search it up youtube.) PLEASE HELP SORRY IF IN WRONG SECTION ITS MY FIRST POST I BELIEVE
I WILL FEEL VERY IF I COULD GET IT FIXED /yea/yea/yea/yea/yea