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I've seen Rohan fail to run because it didn't like the Asus ROG SupremeFX Sound drivers that came with my motherboard. As soon as I found out that the GameGuard wankware was butting it's electronic head against that I tried TEMPORARILY uninstalling them. Sure enough it ran flawlessly after that.
As you can see from my sig, I don't log into the game often. I take exception to games that have a problem with my up-to-date hardware and software stack and couldn't be bothered to uninstall/reinstall system software just to make Rohan happy.