I have a laptop of low configuration, so I have to install the minimum software and also of short size. Then I download this-one from the official site. I have already used the other readers but they acquire large memory space and make slowdown to my system. But when I start using this, that problem is no longer at all. This software give me very fast response. I just love it after using it for a week. This software is very effective for those who have low configuration PC. Thank you.