This message has popped up ever since i downloaded the 0.55.126884 Experimental patch on March 12, 2015. When i go to re-download 0.54 stable, the crash still occurs. Every time i click 'Play', this message pops up.

http://i.imgur.com/ss06soa.png

After this happened, I deleted the 'Battleye' folder in my 'Local' folder hoping it would re-install itself and fix the problem, but it didn't. I didn't know if that was the problem or not.

I also had the -dologs parameter entered in.

THE FILES IN THE RAR FILE WERE TAKEN AFTER I RE-INSTALLED AND TRIED TO PLAY THE 0.54 AGAIN.

*UPDATE*:
I uninstalled DayZ and reinstalled it on my primary operating system SSD (it was originally on my secondary hard drive). I was able to launch 0.54 stable and 0.55 experimental, but when i try to join a server, this message pops up:

Danny uses modified data file -
C:\Users\Danny\AppData\Local\DayZ\MPMissionsCache\__cur_mp.pbo

*UPDATE #2*:
I deleted the pbo file, verified game cache, and launched DayZ again. I can play now! {F31298}