Initialization error at startup

I got it running! Not sure how, but here's what we did.

I uninstalled the game. Then, I did a clean boot after power cycling the router and modem. Created new admin account, and reinstalled the game. It ran. It still ran when I took it out of clean boot, but didn't run on original admin account. I was very confused at this point as they were running the same processes and services. My husband had the idea that I should reset my Nvidia settings to optimized as I couldn't get it out of windowed mode (I put it in windowed mode as a troubleshooting step, after the problem began.) Et Voilà! Now it works on my old account as well. I had tried optimized setting before, so basically I'm still entirely clueless what happened and what exactly fixed it, but I am overjoyed to have my game back. Thank you so much to both of you for assisting me!