I chose to try this software as a free download before buying this version. I had built up somehow a heck of a lot of Bak files on my C: drive. I surfed the net constantly and then i thought i know lets try and there was this programme i quickly downloaded it and started the process. It removed every back file and my hard drive space was now free again. I am going to buy the full version just in case this happens again and will recommend this to anyone. Simply Purge. It should be called the Almighty One it's a sheep in wolf's clothing.