Yes both are Steam Versions of the Game.
We tried now redownloading on his Computer and verify integrety of game cache.
Still reboot...
Mine works only sometime CTD, but now not soo important, his makes his Computer restart like i wrote.
- Event log report - many thanks to zefie for this tutorial
- right click on "Computer" in start Menu, choose "Manage"
- look for the crash in the event viewer for SR4 and post the contents of the dialog box
View attachment 3514