I have been reading some stuff online and the only things i have done is to troubleshoot my problem, i tried disabling openGL and still had the same problem and tried dedicating more ram to after effects and it had no change, i removed the dust from the case i made sure of it, I am very careful when working inside my case as it contains expensive components, I didn’t add any more stuff to the computer nor remove anything. May i add that the cpu using rises dramatically when starting to do a ram preview and the program stops responding for a while before doing anything, I really cant see what i have done to cause this, as it using to run smoothly as anything with no trouble at all.