I can’t enter my password on Windows 10 anymore

Hello, this morning I turn on my computer and it shows me a background of an screen that I had never seen. It’s an image with a big "connected to Windows." However there are time, date, some ads, and the internet connection shown. I click anywhere to go to the next page and enter my password. But that's where the problem is, I click somewhere but the screen goes gray, nothing is visible except the mouse which can still move. I wait and it returns on its own to the page with a big “connected to Windows.”

I try turning my computer on and off, nothing changes. I press a key on my keyboard, the page also goes gray.

I installed a mod last night for a game, maybe that’s the cause, I don’t know. But I can’t do anything anymore.

It would be cool to get some help, thanks