Depending on how the issue shows (crash to desktop, a black screen or something else), troubleshooting steps can vary.
To rule out the most common scenarios, please:
Check if your PC meets the system requirements for Rainbow Six: Siege
If your setup does not meet the minimum requirements for the game, launching it may be impossible.
Complete our general troubleshooting guide
The guide contains a set of universal troubleshooting steps that often resolve issues with launching the game.