okay... my bro brought home his laptop from college cus its going INSANLY SLOW.... im talking 20 minutes just to get past the windows loading screen... once u finally get logged on to the user (another 10 min's)... it takes forever to load simple thigs...i.e. folders, explorer, and so on.... hes got a total of 18GB and has 12GB free.... what can i do to fix this..... and i cant just simply re-install windows because he needs everything thats saved on it.... please help