If it is not installed, than just do nothing in that direction. That command is just helpful for those that have HPET installed and some problems with lagging that might be caused by that. They can try disabling HPET with that command and check if that lagging is gone. BTW @Yevgeny Lazorenko is your problem with Nordschleife gone now? If I remember right, you had some problems with stuttering there?