Ok so my computer keeps on freezing when i am running games, i have to push CTRL+ALT+DEL then cancel to fix it. I went to best buy and asked why and they said ram. I have 4GBs and when im running my game (dragon nest) and i have FB open and music i only have 70% ram used, and even if I close them it stills freezes sometimes with 50% ram used. How can i fix this? plz help!