I just tried to play Skyrim, but I can't launch it anymore.

When I click on play often nothing happens, sometimes I get to the main menue, but then I get a ctd as soon as the menue appears.

I already restarted my pc as well as steam, but it doesn't help.

I didn't add any mods or so, what can I do now?

You could try uninstalling your graphic driver, reboot, download the latest graphic driver and then install it, reboot and then try to launch the game.

I rebooted the pc again, this time I could launch it.

Thanks though.