Hello. i've got some problems with my sony Vaio F series notebook. It has 4 years and in past I could run battlefield 3 on ultra settings without aby problems. Now notebook is very slow and it even can't start net browser fast. There is an Intel i5, quad core 2,3 GHz, 4GB of ram, Geforce NVidia 540m and 500GB of hard drive. I'd like to change the hard drive to new 500 GB disc and change an ammount of ram from 4 to 8 or 16. Would it get it fast? Is this slowly running because of the hard drive which is Old, was formatting many times and the low ammount of ram? Or maybe CPU and GPU are not good after few years of using this notebook? Please help me