I'm on windows 8.1. I get to C/users/name/ and don't see an appdata folder.

Launching steam as admin worked fine.

Launching dayZ.exe as admin I received an error that "msvcp120.dll" is missing from my computer and I should reinstall.

However, one of things I tried before submitting the ticket was deleting and reinstalling the game. I had also previously verified the cache.

However, I just checked this ticket: http://feedback.dayzgame.com/view.php?id=21209&nbn=9#bugnotes

It looks like you guys figured this out, I went into steam (after opening as admin) and pressed play from the steam library. the game downloaded a microsoft vc redistribution package or something, and opened fine.

So far, it appears this issue is fixed on my end, but figured I should provide feedback to help out.