Rf2 doesn't start

Hello, I have just bought rFactor 2 from Steam, I have downloaded everything and installed every program there was in "support", in rFactor 2 main folder. I click play, it opens the launcher, I click singleplayer, it shows rf2 logo and than it goes back to launcher. Can you help me?

 

Did you click the Settings icon (the gear) and click Video Settings? And are those settings correct?

 

Also what are your computer specs?

 

Hello guys, thanks for the answers. Strangely, This morning everything works well, also if yesterday restarting the pc didn't gave me positive results. I hope there won't be anymore problems. Thank you again and good racing!