Thank you for the update Jared. The Forza Horizon 3 game may crash if the graphics card drivers on your computer is not updated or due to a software conflict with the other apps installed on your device. To resolve your concern, please make sure that your Windows 10 device is running version 1607, 14393.102 or later. You may also visit this link on how to find out if a game will work on your Windows 10 device.
For more information and troubleshooting options on how to make Forza Horizon 3 work on your Windows 10 PC, you may visit: https://support.xbox.com/en-US/games/game-titles/forza-horizon-3-faq.
If the issue persists, you may post your concern at Forza Motorsport Support Forums to get in touch with the game developer: https://forums.forzamotorsport.net/turn10_forum15_Forza-Horizon-3.aspx.
Update us with the results for further assistance.