Return of Reckoning

i get the following error when i try to get the latest patch:

Error Downloading HTTP:
System.UnauthorizedAccessException: Adgang til stien 'F:\spil\warhammer\Return of Reckoning\WAR.exe' blev nægtet.
ved System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
ved System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
ved System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
ved RoRLauncher.Client.A98wHY8h7w09xWaFRnT(Object , FileMode , FileAccess )
ved RoRLauncher.Client.qr1ZxRLQGc(Object , Object )


any ideas??