Hello. Just randomly, two nights ago, when I go to start up DayZ and play any server, Steam will completely close down, and I get an error box with the error message of "Unable to located a running instance of Steam".

I have verified the files, flushed the config, cleared the download cache. I've actually escalated my troubleshooting to the point where I just got done completely reformatting and reinstalling Windows and Steam on my computer, but I am still getting the error.