Full Exception Info: System.MissingMethodException: Method not found: 'Microsoft.Win32.RegistryKey Microsoft.Win32.RegistryKey.CreateSubKey(System.String, Boolean)'. at OfficialFSOInstaller.Form1.TSOCabExtractor() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart() any solution for this?