Although R.O.H.A.N. should run properly there are some issues that occur due to compatibility on some systems. If you are having issues running R.O.H.A.N. on one of these operating systems please first try right clicking the rohan.exe file and running as compatibility mode. If this fails you may need to adjust your OS "DEP settings" to allow this to launch. Primarily issues tend to occur on 64 bit version of Vista and Windows 7.