black screen

still slow getting into a game or mission pls help disconnects me from server ,hack tooled ,idle to long kicks me back to lobby i have to buy ram for the game i have system requirements wtf....all kinds of errors crossfire needs to get rid of there past patches and start with a clean slate downloaded game booster didntg work for me....please help witha any sujestions please .....since zombie patch i havent played i love the game not giving up....almost gold....