|disable any antivirus if you have installed before playing a game....|
try installing "game booster"
it eases your cpu from other not required stresses
if your cpu is multi core then open task manager while running the game
in process tab locate the game process, right click>set affinity
then deselect everything except cpu 0..
this shifts load of all the calculations on a single core and avoids distribution of processes to different cores...