JOYSTICK AND CRASH ON STARTUP FIX

I apologize if my english isn't good, It is not my native language.
The solution is simple, you must go on your library on steam, and then, right click the F1 2015 game, click on properties then, go to installed files, and then, browse
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after doing that, you need to scroll down, and find the F1_2015.exe (executable) and right click it, go to properties.
After that, you're going to the compatibility tab (i apologize if you don't understand as my windows is on spanish, but it is exactly the same steps on the english version) and change the compatibility mode to Windows 8, that atleast fixed the problem for me, if not, check the other guide that can help with the multi-core problem.
If this step doesn't work, disabling fullscreen optimizations might help, but I don't really know what that does in details, so I leave that up to you.

This one is a little bit easier, you're just going to plug your controller, and in steam library, going to find the Unknown controller support box on steam

Then you're going to go to view controller settings, and enabling steam input

After enabling steam input, you don't need to do anything else, unless you want to, but if you do know what you're doing, you don't really need so much details in steps as i've done for this guide.

IMPORTANT
After that, whenever you want to play, you must unplug your controller before starting the game, always do that, and when the game goes into season select screen, you can plug it again.