hitman Absolution Failed to start (game app already running)

Have you tried restarting Steam?

Restart the steam.

I wouldn't worry about it. You're not missing out.

did you check your task manager and see if a exe is sill running? or did you try to restart your pc ?

Try verify ur game then restart steam

Assuming you have already verified the game files in Steam, how about starting it, then walking away for a while.

Given that it's your first run since downloading, it may take a long time to install and get going. How about starting up the game, then leaving it to do its thing for 20 minutes and see if that makes any difference? If not, check Task Manager and see if the exe file is still running.

Also, this may be an exceptionally stupid question, but do you have a DX10 capable graphics card?

Restart steam and it will work.

Restart your computer

Uninstall it and reinstall.

Update the drivers for your graphic card.