Possile solution for startscreen crash problem: switch back to Nvidia Driver 368.22!
At least that worked for me!
This worked but I don’t think it’s necessarily directly related to the driver as to test I went back to 368.39s and the game is working fine. When my crash at startscreen problem occurred I had already been Forza on the 39s for at least a week. There’s definitely something driver related being saved into one of the .dat files that others reported deleting worked for them.
edit: I will also add that after the driver change, all my video resets were at minimum resolution of 1366x768 and low settings down from 1440p Ultra.