Got all three games but Call of Pripyat does not work. I run the game and it flicks me on desktop sayin smthng about x ray engine problem?

Anyone can help?

When S.T.A.L.K.E.R. crashes, it should copy the error to your clipboard. Can you Ctrl+V anything after the error message?

o.k. thanks, i reinstalled it for 3rd time and now it works. I just cannot have video settings on max?! Weird, because CPU is i7, graphic card is geforce GTX 760, 4GB ram...

Try right clicking the Stalker call of pripyat exe and unchecking the run as administrator (Admin) option under properties. When you get into the game set it to DX11 in the options. It doesn't seem to want to run in DX9 with admin on. Say yes to the window that pops up and then exit. Put admin back on and it should run good from there.

That last one helped with me. DX11 did the trick! I also didn't see this option, only DX10 until I saw you can scroll down. Thank you very much! I've played for three hours now, not one crash.