More about : games lag
Full overhall system change needed. Dual core is ancient, your graphics card is way to weak & your ram is way tooo less. 4gb is imho basic std 4 running win7 with hardly spare ram left for the applications. Prototype n spiderman are not graphic or gpu intensive. If you want true potential games try like far cry 3 , crysis, metro series , bf3 or arma 3. All these games will run like slideshow on your system. To top it all laptops are Never meant for gaming n AC series have never ever been properly optimized 4 pcs.