When you say memory, I presume you mean hard drive space? It could be the problem, 20MB is nothing these days. How about putting some of your files on to DVDs or CDs, or better, an external hard drive and clearing some space on your C drive?
The Evil Within 2 review-in-progress
InVision Studio takes on Adobe XD and Sketch
Camera tips to take better iPhone photos
Comment transformer un iPhone en borne Wi-Fi ?