Most computer users have had it happen to them. Their screens start to pop up with weird notifications and the state of the art system they thought they had is running at a snail's pace. The chances are very good that the only thing wrong with the computer is a shortage of memory. Before you run out and buy a bunch of memory for your system, you want to be sure that is truly the problem. There are four tell tale signs that your computer needs more memory to operate at its highest potential.