Hello, I am a die hard DayZ player/fan, and I play this game on a nearly 5 hours a day schedule. I was not enjoying the game as much as I thought I should be, due to fps lag. My computer is not the best, and is probably why I receive avg. 18 fps. I decided to download a program to boost your game's speed for lower end PC's... as soon as I opened the program it close immdiately, I tried opening DayZ through DayZ Commander and I get a message saying, "Bad serial number given in setup". I have tried the tutorial through the stickied thread but I am unable to Verify integrity of game cache, due to my Arma 2 being bought from the store and non-steam. Our family is very poor and I cannot afford to buy another copy, please someone reply giving me a solution for non-steam users. TL;DR Stolen key from "game enhancing program". I cannot verify integrity of game cache because I am non-steam. Need help. Thanks a lot everybody...