Thank's all for your help !
For the patch, i have tested the patch 7, not fonctionnaly, the game crash latest the chargement !! ( Lool )... I'm crazy !
For my ram, i have 4 gb, 3,250 because Windows Vista is very bad ! 3,250 is the max for windows vista :/
Tomorow or 2 day's y try your method's thank's for your help and sorry for my english ^^' .