Return of Reckoning

for some reason when I put username and password and click connect nothing happens before I was able to login and play now I cant

Error starting: System.UnauthorizedAccessException: Access to the path 'C:\Users\Rain\Desktop\war\Warhammer Online - Age of Reckoning\WAR.exe' is denied.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess ...