Might try closing out steam and ubisoft, then restarting them. Sometimes the game keeps running in the background and can't be accessible.

Hello Lanrix,

Thanks for reaching out.

I'm sorry to hear that you're having trouble launching the game. Just to confirm, do you also have the Ubisoft Connect application installed on your PC? This app is required even if the game has been purchased through Steam.

In the meantime, I advise you to attempt these troubleshooting steps[ubi.li], as they will help rule out common causes of the game not launching.

Looking forward to hearing from you soon.

Thanks!

I reinstalled the drivers for the processor and it worked, thanks